AI agent developer tools
Every listing tagged agent, A to Z: 116 tools across 6 categories. Listed in alphabetical order, not ranked.
Agensh
Microsoft's open-source (MIT) multi-agent harness with no central orchestrator: agents claim sub-tasks, share findings, verify results and merge progress through a shared workspace, with experiment scripts and a reproduction guide.
agent-archive
CLI to archive Claude Code, Codex and Cursor sessions to your own S3 or R2 bucket and hand a session's context off between agents or machines, plus browse history by topic, project, branch or PR. MIT-licensed, written in Go.
agent-relay
Open-source (MIT) relay that lets coding sessions from different vendors work together, tested with Claude Code and Codex: one session leads, the other follows, the relay passes each turn across, records it on your disk and stops when something needs your decision, with a web console to watch and answer. macOS, Python 3.11+.
Agentic Resource Registry
Self-hosted, open-source (Apache-2.0) registry for sharing a team's coding agent resources (skills, agent files, MCP servers) with usage insights; works with Claude Code, Kiro, Cursor, Codex, Pi and more through the observal CLI. Formerly Observal.
Alkera
Agentic data platform where data engineers, analysts and agents collaborate in multiplayer notebooks and chats, with column-level lineage and a knowledge base; built on the open-source Databench workspace, free tier available.
Argus
Open-source (MIT), self-hosted security operations platform: AI agents triage and investigate alerts with read-only tools, while response playbooks start in shadow mode, use reversible actions and can be approved from Slack.
AutonomyAI
Autonomous product delivery on your real codebase: research, plan the spec, build with your own components and conventions, verify in the running app and hand engineers a review-ready pull request.
Beam
Puts windows from one Mac onto another as native windows with real input, so agents and builds can keep running on a Mac mini or Studio while you work from your laptop; encrypted, direct over your own network, subscription or lifetime license.
Bland AI
Voice agent platform for phone calls with one per-minute rate that covers the LLM, speech-to-text and text-to-speech: Conversational Pathways for call flows, knowledge bases, version lock, your own Twilio or SIP trunk, and on-prem or VPC on Enterprise. Start plan $0.14 a minute with no platform fee and no card.
Braintrust
Observability and evals platform for AI agents: trace production calls from OpenAI, Anthropic, Gemini, the Vercel AI SDK, LangChain and more, run experiments scored by LLM judges, Autoevals or your own code, review in playgrounds and human annotation queues, and let the built-in Loop agent generate test cases and build evals. MCP server and a bt CLI. Free Starter plan with unlimited users; Pro $249 a month.
Braus
Mac app that gives AI agents their own desktop workspace to work in apps that have no API, while you keep using your Mac; connect Claude Code or Codex over MCP. Formerly Mecum.
Browser Use
Open-source (MIT) browser agent: run it from Python with any LLM, give Claude Code or Codex a browser through its CLI skill, or use Browser Use Cloud for stealth browsers with CAPTCHA solving and residential proxies and a hosted agent API. Pay as you go, no subscription: cloud browsers $0.02 an hour, $1 free credit.
Browserbase
Cloud browsers for AI agents: fleets of headless browsers that log in, fill forms and act where there is no API, plus Search and Fetch APIs, CAPTCHA solving, live view and session replay. Drive them with Playwright, Puppeteer, Selenium or Browserbase's open-source Stagehand SDK (MIT). Free plan; Developer $20/month.
Buddy Sandboxes
Persistent Linux VM sandboxes for AI coding agents from Buddy: Ubuntu with passwordless sudo, Docker, SSH, a 50 GB disk that survives restarts, public HTTPS endpoints and snapshots, up to 12 vCPU and 24 GB of RAM, driven from a CLI, TypeScript SDK, REST API or MCP tool call. $0.0144 per vCPU-hour plus $0.0144 per GB of RAM an hour, billed by the minute.
Busabase
Open-source (MIT) database and workspace that acts as a system of record for AI agents: agents and people share data, docs, skills and apps, every change keeps its history, and important writes can wait for review; desktop, self-hosted or Busabase Cloud.
Charter
Open-source (Apache-2.0) Python library for AI agents that act in your customers' accounts through APIs: each tool is a Pydantic model that mirrors the API field by field with your rules on top, every call is validated before it is sent, the customer a call is for comes from your app rather than the model, and the same declarations produce a reviewable map of everything each tool can reach. Runs in your process with no proxy or telemetry; works with any HTTP API. pip install charter-ai.
Claude Code
Anthropic's agentic coding tool that runs in the terminal and works across your codebase.
CodeConnect
iPhone app plus a small daemon that puts Claude Code and Codex sessions from your Macs and Linux machines on one screen: see every agent waiting on you ranked by risk, approve or deny the exact command (risky ones need a hold and Face ID), answer questions, review diffs and take over the live terminal. Connects over your own Tailscale tailnet with no CodeConnect server or account. The app is free; iOS 17+, macOS 13+ or Linux x86_64/arm64.
CodeRabbit
AI code review for pull requests on GitHub, GitLab, Azure DevOps and Bitbucket, and before the PR in the CLI, your IDE and coding-agent loops: plain-language walkthroughs, one-click fixes, pre-merge checks, slop detection for low-quality AI PRs, and reviews that learn from your team's feedback. Free on public repos.
Coderblock
Vibe-coding platform that builds full-stack web apps from chat with a team of specialist AI agents in a 3D office.
CoIsland
Mac app that watches your engineering stack (GitHub Actions, Sentry and more), shows only what needs you and hands the work to Claude Code, Codex or Cursor; keys stay on your Mac, lifetime from $29.
CoreSpeed
One MCP endpoint that gives Claude Code, Codex or Cursor your apps, your team's shared memory and built-in tools, with spend caps, approvals and an activity log; free plan, Pro $20/month.
Corgi
Open-source (MIT) terminal and agent multiplexer for macOS, Linux and WSL: shows what each Claude Code, Codex, Pi or OpenCode agent is doing and which needs you, keeps sessions running in the background like tmux, and tracks worktrees, changed files and per-workspace resource usage.
CrewAI
Open-source (MIT) Python framework for multi-agent automation: Crews of role-based agents that work one task together, and Flows for event-driven control that mix single LLM calls with Crews. Standalone, not built on LangChain. CrewAI AMP adds managed deployment, tracing and governance; free plan with 50 workflow executions a month.
Cursor
AI coding agent and VS Code-based editor with codebase-aware chat, autocomplete and agent mode.
CybeDefend
Security and business rules for AI coding agents: one command installs VibeDefend into Claude Code, Cursor, Copilot or Codex to scan each diff and block risky actions, with SAST, SCA, secrets and IaC scanning; free plan.
Daytona
Sandboxes for AI-generated code, each with its own kernel, filesystem and network: Linux, Windows, macOS and GPU machines built from OCI images or snapshots, with volumes, computer use and an MCP server, driven from SDKs for Python, TypeScript, Ruby, Go and Java. Runs on Daytona's cloud or your own compute. Pay per second, with $200 of free compute.
Deedglass
Safety layer for AI agents that change databases and health records: rules decide each agent tool call, a check compares what the system really changed with what the agent reported, and each action is sealed as a signed record anyone can verify offline, with a person able to undo it. npx deedglass opens a local app in your browser with no account; works with Claude Code, Cursor, Claude Desktop, VS Code and Postgres. Apache-2.0 core, ee/ under FSL-1.1-ALv2.
Devin Desktop (formerly Windsurf)
AI-native IDE from Cognition, renamed from Windsurf (originally Codeium), with the Cascade agent for multi-file edits.
DocuMemory
Memory engine for AI-first engineers: distils Claude Code, ChatGPT and Cursor sessions into architecture decisions and prompt-injectable context blocks, recalled over MCP or a REST API; 15 free distillations, then from $10/month.
Dropstone
AI coding agent for the terminal and your IDE with one memory across chat, CLI and code: correct it once and it applies the lesson everywhere; runs on self-hosted models, plans from $5/month.
E2B
Open-source (Apache-2.0) cloud sandboxes for AI agents: each sandbox is a Firecracker microVM that resumes from a snapshot, driven from the Python or JavaScript SDK, with a Code Interpreter SDK for running model-written code. The runtime can be self-hosted on your own hardware. Hobby is free with a one-time $100 credit; Pro is $150 a month plus per-second usage.
e2e by TesterArmy
Open-source (Apache-2.0) end-to-end testing framework for web, iOS and Android: describe a goal in plain language, an agent drives the app, and assertions verify the result; recorded steps replay with no model calls. From YC-backed TesterArmy.
ego lite
Free browser for AI agents on macOS, with Windows in beta: Claude Code, Codex or Cursor drive it through the open-source (MIT) ego-browser skill in their own isolated Spaces while you keep browsing, inheriting your Chrome logins and cookies; Linux is on the roadmap.
ElevenLabs Agents
ElevenLabs' hosted platform for voice agents: its own speech-to-text, your choice of LLM or a custom model, 10,000+ voices, a turn-taking model, a visual workflow builder, knowledge bases, tests and A/B experiments. Deploys to phone over Twilio or SIP, a web widget, or iOS, Android, React Native and Unity SDKs. Free plan with 15 call minutes; $0.08 a minute after that, LLM billed on top.
Ellf
Explosion's tool that plugs into Claude Code, Codex or Copilot to plan, annotate, train and evaluate custom NLP systems.
Enzyme
Open-source (Apache-2.0) Rust tool that builds a local index of your Markdown notes from their folders, tags, links and dates, so Claude Code, Codex or another terminal agent can pull up related notes and cite them.
Frink
Open-source (MIT) desktop app for macOS and Linux to run parallel coding agents and multi-step Flows triggered by schedules, webhooks or events from Linear, Sentry, PostHog, Vercel and more, with approval steps and a Work Queue; runs locally with the AI coding tool you already use, no account.
GitHub Copilot
GitHub's AI pair programmer with completions, chat and coding agent across popular editors.
Gleap
AI-native help desk for software teams: in-app bug reporting and session replay plus Kai agents that answer customers, investigate tickets and open code fixes your team reviews; plans from $29/month.
Google ADK
Google's open-source (Apache-2.0) Agent Development Kit: code-first agents and graph workflows, multi-agent hierarchies, MCP and OpenAPI tools, tool confirmation, a local dev UI and built-in evals. Optimized for Gemini but model-agnostic. Python, Java, Go, TypeScript and Kotlin; deploy with Docker, Cloud Run or Vertex AI Agent Engine.
Google Gemini CLI
Google's open-source (Apache-2.0) coding agent for the terminal: it reads and edits your codebase, runs shell commands, connects MCP servers and runs headless with gemini -p for scripts. Now built for Gemini Code Assist Standard and Enterprise teams and paid Gemini API or Vertex AI keys; free and Google AI Pro/Ultra users moved to Antigravity CLI.
Greptile
AI code reviewer that indexes your repo as a graph of files, functions and dependencies, then runs a swarm of agents over each pull request to catch bugs beyond the diff, and learns your standards from teammates' review comments. Works with GitHub, GitLab and Bitbucket; Enterprise adds self-hosting, Gitea and Perforce.
Halv
Desktop workspace that runs Claude Code, Codex, Kimi and GLM side by side on the plans you already pay for, with up to 32 live panes, a local code index and context compression to cut token spend. The app is open source (Apache 2.0) on macOS, Windows and Linux; optional Halv Cloud routing is $10/month.
Handshake
Native macOS workspace for coordinating coding agents, formerly Twine: controlled workflows, visual traces and cross-agent memory, with roles filled by Codex, Claude Code, OpenCode, pi, Antigravity, OMP or Kiro CLI. Apple Silicon, macOS 26+, MIT-licensed.
Hazzel
Small, readable open-source (Apache-2.0) terminal coding agent in Python: bring your own key for one of eight providers or run Ollama locally, no subscription, every change shown as a diff before it touches disk, with undo, /review, /commit and per-turn token cost.
iFixAi
Independent auditing for AI agents: finds where an agent hides information, overrides decisions or takes unauthorised actions behind a successful result, with recurring audits and reports per agent.
Jotbus
End-to-end encrypted shared scratchpad that lets Claude Code, Codex, Cursor, Gemini and other coding agents share notes and files, hand off work and review changes across machines; try it with npx jotbus.
Kavach
Open-source (Apache-2.0) flight recorder for journal-driven services: records every input, clock read and random read, and when a step panics or breaks an invariant writes a .kavach fixture that replays the crash byte for byte with no broker, database or network, then rejects narrow fixes that fail across perturbed variants. SDKs in 12 languages plus agent skills; pre-alpha.
LangGraph
LangChain's low-level orchestration framework for long-running, stateful agents: durable execution that resumes where a run failed, human-in-the-loop checks on agent state, and short- and long-term memory. Python 3.10+ or LangGraph.js, with or without LangChain. Open source (MIT); deploy it yourself or on LangSmith Deployment.
LangSmith
LangChain's platform for agents: tracing and online and offline evals for any framework, plus managed agent deployment, sandboxes and an LLM gateway; cloud in the US or EU, hybrid or self-hosted on Enterprise.
Latitude
Open-source (MIT) observability and quality platform for AI agents: traces production runs, groups failures into tracked issues with evals attached, dispatches your coding agent to fix them and replays the fix against the failing traces. MCP server and CLI. Free Starter plan with 20K credits a month; Pro $99 a month.
Letta
Stateful agents with memory that persists and improves with experience, from the makers of MemGPT: Letta Code ships a terminal UI, an app server for self-hosted agents and an Agent SDK, with Letta Cloud to carry memory across machines. Open source (Apache-2.0); free with your own API keys, Pro $20/month.
Lights-on Software Factory
Open-source (MIT) boilerplate for running Claude Code as a software factory: a sandboxed container, a deterministic bash-command regulator, lint hooks for custom rules and a multi-agent workflow generator.
LiveKit Agents
Open-source (Apache-2.0) framework for realtime voice and video agents in Python or Node.js: mix any STT, LLM, TTS or realtime model, semantic turn detection, MCP tools, a built-in test framework and phone calls through LiveKit's SIP stack. Self-host the whole stack with the open-source LiveKit server, or deploy to LiveKit Cloud, free for 1,000 agent minutes a month.
Mastra
TypeScript framework for AI agents and apps: agents with tools, graph-based workflows that suspend for human approval and resume, model routing across 40+ providers, built-in evals and observability, and Mastra Studio to test agents locally. Apache-2.0 outside its ee/ enterprise directories; Mastra Platform free to start, Teams $250/month.
Maximem Synap
Memory and context layer for AI agents with entity resolution, temporal reasoning and scoping built in, sub-15ms recall, a hosted MCP endpoint and native adapters for 23 agent frameworks including LangChain and the Claude Agent SDK; free tier, paid from $19/month.
MELRA
Open-source local MCP runtime that checks AI-agent tool calls against policy, gates risky actions on approval, verifies results and parks uncertain outcomes instead of blindly retrying after timeouts. Alpha; AGPL-3.0, SDKs Apache-2.0.
Mem0
Memory layer for AI agents and apps: send it conversations and it extracts, updates and retrieves the memories that matter for each user, through Python and Node SDKs, an API, MCP and a CLI. Open source (Apache-2.0) as a library or self-hosted server, or the hosted platform with a free plan.
Modal Sandboxes
Sandboxes on Modal's serverless cloud for running untrusted or LLM-written code, created from Python, JavaScript or Go: gVisor isolation, or a VM with its own Linux kernel when you need Docker or FUSE, plus GPUs, custom images, volumes, filesystem snapshots and runs of up to 24 hours. Billed per second; the Starter plan includes $30 of compute a month.
Nace
Execution layer for agents: a Perception API that reads any file and a Decision API that makes small calls in under 200 ms on fast, low-cost models, under one API key; Drex models with open weights.
Navige
Sits between AI agents and the models they pay for to cut spend via caching, smart routing, context trimming and loop guards.
Omnara
Open-source managed agent platform, pitched as a self-hostable alternative to Claude Managed Agents and OpenAI's Agents API: run AI agents on any model and any machine through an API and CLI, with tools, secrets, permissions and streaming built in. Self-host free under Apache-2.0 or use Omnara Cloud.
Opaline
Team-wide, message-level analytics for Claude Code and Codex sessions: token cost, time and skill usage for every message across your team; open-source CLI, paid team plans.
OpenAI Agents SDK
OpenAI's open-source (MIT) SDK for multi-agent workflows in Python or TypeScript: agents with tools, handoffs, guardrails, sessions and human-in-the-loop, built-in tracing, sandbox agents for long tasks, and voice agents. Works with the OpenAI APIs and 100+ other LLMs. Free; you pay for model usage.
OpenAI Codex CLI
OpenAI's open-source (Apache-2.0) coding agent that runs locally in your terminal: it reads your repo, edits files and runs commands, with codex exec for scripts and CI. Sign in with ChatGPT or use an API key.
OpenCode
Open-source AI coding agent for terminal, desktop and web, with multi-session agents and 75+ model providers.
Opengeni
Open-source cloud agent harness: every agent gets its own computer plugged into your repos and tools, runs for hours after you close the laptop, and the team shares the work; EU-hosted, any model, Pro from $20/month.
Palomino
Free Mac app written in Rust for running Claude Code, Codex and Pi side by side in one window, with GPU-rendered terminals, browsers and files, unlimited workspaces and no account required; Windows and Linux have a waitlist.
Parley
Open-source (Apache-2.0) single Go binary that puts your Claude Code, Codex and OpenCode sessions on one local IRC channel with you, so they tell each other when something changes and ask when they need input; you read every line in any IRC client, only your nick carries authority, and a breaker stops runaway loops until you write.
PatchWave
GitHub app whose agent analyzes, fixes and merges Dependabot PRs using static analysis plus AI, with a prioritized inbox and auto-merge policies you control; 25 free dependency PRs a month, paid plans from $10/month.
phpClaw
Open-source (MIT) AI agent framework for PHP 8.1+: a ReAct loop with tools (allowlisted shell, HTTP with SSRF checks, sandboxed file access, database queries, code search), memory and guard chains that screen messages before the model sees them. Works with Anthropic, OpenAI, Groq, Gemini, Mistral, DeepSeek or Ollama; eight adapters for Laravel, Symfony, Drupal, Magento, WordPress/WooCommerce, Joomla, PrestaShop and OpenCart, and an MCP server package that exposes your tools to Claude Code or Cursor.
pi-cowboy
Open-source (MIT) multi-agent orchestrator for the Pi coding agent that runs Pi, Claude Code, Codex or OpenCode as parallel subagents in isolated copy-on-write Git worktrees inside Herdr panes.
Pidgeon
Email inboxes for AI agents, hosted in the EU: one API call gives an agent its own address to send, receive and reply in threads, read attachments, book meetings and sign up for tools without your credentials, with a firewall that flags hidden instructions in inbound mail, scoped keys, a 90-day audit trail and human handoff. TypeScript SDK plus plugins or MCP for Claude Code, Codex, Cursor and Gemini CLI. Free plan (3 inboxes, 3,000 emails a month), Developer EUR 20/month, Startup EUR 200/month.
Pipecat
Open-source (BSD-2-Clause) Python framework for realtime voice and multimodal agents, maintained by Daily: composable pipelines over WebRTC or WebSockets, 80+ LLM, STT and TTS services, Pipecat Flows for structured conversations, multi-agent handoffs and client SDKs from JavaScript to ESP32. Run it anywhere, or on Pipecat Cloud from $0.01 an active minute.
pocketty
SSH terminal for iPhone and iPad made for herdr: end-to-end sealed alerts when a coding agent is blocked or done, keys in the Secure Enclave, and real keystrokes to answer it. 14-day trial, then a one-time purchase.
Polylane
AI SRE that connects your code, infrastructure and observability data, catches risky pull requests before they merge, investigates production issues and opens a pull request with the fix; free plan, paid from $80/month.
proc
Open-source (MIT) Rust CLI for macOS, Linux and Windows that finds and manages processes by port, PID, name or path: see what is on :3000 and why, then stop or free it, with confirmations and --dry-run. Ships an agent skill so Claude Code, Codex, Cursor and Gemini CLI know when to use it.
pw-repl
Open-source (MIT) Playwright REPL that drives Chromium over CDP, in your own browser with its logins or a headless one, shared by you and your AI agents: agents send commands with pw-repl send, every command shows in the REPL, and watch records your manual steps for the agent to read.
Pydantic AI
Typed Python agent framework from the Pydantic team: any model a string swap away with fallback, validated structured outputs, MCP, evals and durable execution on Temporal, DBOS, Prefect and more. One agent runs as a CLI, a web chat or a realtime voice agent. Open source (MIT) and free; Logfire tracing is optional.
Qodo
Multi-agent AI code review for pull requests on GitHub, GitLab, Bitbucket, Azure DevOps and Gerrit, with a rules system built from your PR history, cross-repo review that catches breaking changes downstream, and a CLI toolbox that gives Codex, Claude and Kiro a review step inside the agent loop.
RDST
Readyset's open-source desktop agent that watches PostgreSQL or MySQL read-only, flags slow or regressed queries and proposes index, setting or rewrite fixes.
Reason
Autonomous software engineer for GitHub that opens evidence-backed pull requests; use it from the web, Mac app, terminal or Slack.
Recto
Free desktop design canvas for coding agents on Mac, Windows and Linux: it detects the Claude Code, Codex, Cursor or OpenCode CLI already on your machine and runs it inside a visual workspace where you build UI, motion, SVG and 3D, drag and restyle elements directly, pin comments that go straight to the agent, and keep variations side by side. Real HTML and CSS underneath with a CSS-variable design system and web import; runs locally with no MCP or API setup.
Retell AI
Platform for AI phone agents: a drag-and-drop call-flow builder, simulation and regression tests, outbound campaigns, live call monitoring with takeover, IVR navigation and CRM write-back, plus chat and SMS agents. Pay as you go at $0.07 to $0.31 a minute depending on model and voice, 20 concurrent calls included and $10 of free credit.
Reticle
AI app testing that runs inside your app: it walks a flow like a user and reads network calls, app state and the console so your coding agent can verify its own work; free open-source SDK for Claude Code, Cursor and any MCP agent.
Rinkata
Shared source of truth for teams building with coding agents: goals, specs, decisions and completion evidence that Codex, Claude, Cursor and other agents read and update; works with GitHub and your review habits.
rostr
Open-source (MIT) CLI, hooks and skill that give every Claude Code or Codex session a unique name and emoji drafted from a roster you pick, so notifications and messages are traceable and agents can refer to each other; rostr stats shows who is working on what. Works with tmux and herdr; local by default, optional end-to-end encrypted cloud roster.
Runloop
Devboxes for AI agents: micro-VM sandboxes with a VM and a container as two layers of isolation, on arm64 or x86, with full Docker support, snapshots you can branch from, suspend and resume, and browser and computer use. Python and TypeScript SDKs (MIT). Free plan plus usage with a $50 trial credit; Pro is $250 a month; Enterprise deploys into your own AWS, GCP or Azure.
Sectr
Serverless backend platform for deploying AI agents built with LangGraph, the OpenAI Agents SDK or Pydantic AI in two lines: one transcript of every message, tool call and approval, agents that scale to zero while waiting for human approval and resume where they stopped, and an AG-UI endpoint for CopilotKit or any frontend. sectr dev gives a local chat UI; free to deploy during beta.
SIwithin
Runs Claude Code or OpenAI Codex CLI unattended on a brief, fenced to the folders you give it and under a per-run dollar budget enforced by a loopback API proxy, leaving one ledger line per run. Single Python file, standard library only, macOS only, Apache-2.0.
Skillsync
Mac app and CLI that searches all your past coding-agent sessions before each prompt and hands your agent a short recollection with sources; works with Claude Code, Codex, Cursor, OpenCode, Amp and more, indexes locally, with shared team workspaces.
Slate Terminal
Native macOS terminal built on libghostty that your coding agents can control and extend: ask an agent to build custom panels, commands and layouts in HTML, CSS and JavaScript, and see which agent is working in each pane. Requires macOS 27 on Apple silicon.
Solid
AI agents with their own computers, accounts and budgets that build apps, automate workflows and run long jobs end to end, using your tools through APIs or a real browser; plans from $20/month.
Sphinx
Free, MIT-licensed Git hook that quizzes you on what your coding agent's diff actually does before a push to protected branches goes through; works with Claude Code, Codex, Cursor or plain Git.
Spotnote
Open-source (MIT) Vite plugin: click any element in your running app, type what should change, and get a prompt with the exact source file, line and column to paste into Claude Code, Cursor or Codex; local-only and dev-mode only.
Steel
Open-source (Apache-2.0) browser API for AI agents: Steel Browser runs Chrome sessions you drive with Puppeteer, Playwright or Selenium, keeps cookies and storage across requests, rotates proxies and turns pages into Markdown, screenshots or PDFs. Self-host it with Docker or use Steel Cloud, free to start with $30 of credits.
Supermemory
Memory and context engine for AI agents: learns from each user's chats, files and URLs, stores it in a vector-graph database and injects what matters into your agent's context, through an API, MCP and plugins for Claude Code, Cursor and more. Open source (MIT); hosted free plan with $5 of credits a month, Pro $19/month.
sweet-search
Open-source (Apache-2.0) local code search for AI coding agents: index a repo once and the index updates itself as you edit, uncommitted changes included, then Claude Code, Codex or opencode get six tools (search, grep, find, semantic, trace, read) in place of grep-and-read. Models run on your machine with no API keys or cloud; the author reports 5-33% cheaper agent runs across 200 tasks. macOS and Linux, Node.js 22+; npm install -g sweet-search.
Synthflow
Enterprise platform for AI voice agents on customer calls, sold as one annual contract that covers telephony (Synthflow's own or SIP), CRM and calendar integrations, security review and launch by forward-deployed engineers. SOC 2 Type 2, ISO 27001, HIPAA and GDPR. No free plan or per-minute rate.
Tenbri
Open-source Agent Decision Record: a signed, append-only, hash-chained record of every decision an AI agent makes, verifiable offline; one line instruments Claude, OpenAI and LangGraph agents, with Python and TypeScript SDKs and plain files on storage you control. Apache-2.0, written in Rust.
Tiden
Intent verification for coding agents: keeps versioned specs beside your code and checks agent changes against what you asked for.
Tofu
Paste one message into your coding agent and your app goes live at its own link; Tofu also sets up saved data, sign-in, a custom domain and user emails in one account. Free for one app, paid plans from Starter.
uji
Small, lightweight terminal coding agent where everything is a module you can swap at runtime, even the core: every view is Lua you can rewrite, and you add plugins as you go. Install with a curl script or Homebrew; GPL-3.0.
Vani Code Agent
Free VS Code extension coding agent with diff review and command approval, backed by the Vani API.
Vapi
Developer platform for voice agents that make and take phone calls: pick the transcriber, model and voice from dozens of providers, build single assistants or Squads that hand callers between specialists, test with simulations and manage config as code from a CLI. $0.05 a minute for Vapi hosting, with providers passed through at cost and $5 of free credit.
Vercel Sandbox
Firecracker microVM sandboxes on Vercel for running untrusted or agent-written code, from a JavaScript or Python SDK or the CLI: Node.js, Python and coding agents in the default image or your own OCI image, Docker inside, persistent sandboxes, snapshots and drives. CPU is billed only while active, with a free monthly quota on Hobby.
W&B Weave
Weights & Biases' toolkit for tracing and evaluating AI agents: sessions, turns, tool calls and sub-agents as first-class traces, an evaluation framework with comparisons and leaderboards, built-in signals with Slack alerts, guardrail scorers for toxicity, PII and hallucinations, a playground, and an MCP server so coding agents can read traces and run evals. SDK is open source (Apache-2.0); free plan with 1 GB of trace data a month, Pro from $60 a month.
walkai-talkai
Talk to Cursor, Claude Code or Antigravity over any handheld two-way radio: local Whisper transcription on your Mac types the command, and neural TTS reads the answer back with VOX tones; one-time lifetime license, Apple Silicon.
Weatherdeck
Open-source, read-only status board for TV or phone showing what your AI coding agent lanes and machines are doing and what is waiting on you.
Weir
Open-source (Apache-2.0) API key leak detection for AI agents: plants fake keys where real ones live, runs your agent's flows and reports whether they reached traces, logs, console output, the model or other services (leak, clean or incomplete), and in Claude Code shows which of your real keys entered or left a session, with an optional hook that redacts them. pip install weir-scan.
Whiteboard
Open-source canvas for thoughtful software design: review interactive visualizations, diffs and agent trajectories in one interface on macOS, Windows and Linux; by /dev/fast (YC W26).
withHuman
Open-source human approval layer that intercepts AI agent tool calls, applies rules, and routes risky actions to reviewers.
XTrace
Open-source macOS app (Apple Silicon) that reads your local Claude Code, Codex and Cursor history to show agent activity, estimated human time, API-equivalent spend and how fast you are using your Claude and Codex limits. Apache-2.0.
Zep
Context and memory layer for AI agents: turns conversations, documents and business data into a temporal Context Graph per user, account or domain, with dated facts traced to their source and retrieval under 200 ms. Zep Cloud, your own encryption keys or your VPC; its graph engine Graphiti is open source (Apache-2.0). Free 10,000 credits a month.
ZooWork
AI agent delivery platform: domain experts build in the Builder UI while developers ship through the Managed Agent API, with approvals, security and control for real business operations.