Best Free AI Developer Tools tools

A collection of deliberately vulnerable MCP servers for training in agentic security, mapped to the OWASP Top 10 for Agentic Applications.

Open-source AI tool for deep infrastructure research, running frontier models across code, cloud, and runtime to deliver verified answers.

Magpie is an opinionated accounting CLI for humans and AI agents, providing double-entry bookkeeping with RBAC and immutable event storage on Jaybase.

Terminal UI to manage AI coding-agent sessions (Claude Code, OpenCode, Codex, Grok Build) in tmux with live status, group tree, and diff review.

A voice-controlled IDE that enables developers to initiate AI coding sessions with Codex or Claude Code, approve commands, and review diffs from their phone.

Zero-config, single-binary software catalog with auto-discovery, dependency visualization, compliance scorecards, and native MCP integration for AI agents.

Browser automation CLI for AI agents to bypass anti-bot walls, hand off to humans, and run parallel tasks.

An AI-powered shopper assistant that provides a live cursor to guide website visitors, point out products, and display price calculations.

Self-hostable sandbox SDK for AI agents that provides isolated environments with key management and egress control on your own hardware.

Open-source desktop app to manage multiple project workspaces simultaneously, keeping terminals and AI coding agents running across projects with instant switching.

A collection of deliberately vulnerable MCP servers for training in agentic security, mapped to the OWASP Top 10 for Agentic Applications.

Open-source AI tool for deep infrastructure research, running frontier models across code, cloud, and runtime to deliver verified answers.

Magpie is an opinionated accounting CLI for humans and AI agents, providing double-entry bookkeeping with RBAC and immutable event storage on Jaybase.

Terminal UI to manage AI coding-agent sessions (Claude Code, OpenCode, Codex, Grok Build) in tmux with live status, group tree, and diff review.

A voice-controlled IDE that enables developers to initiate AI coding sessions with Codex or Claude Code, approve commands, and review diffs from their phone.

Zero-config, single-binary software catalog with auto-discovery, dependency visualization, compliance scorecards, and native MCP integration for AI agents.

Browser automation CLI for AI agents to bypass anti-bot walls, hand off to humans, and run parallel tasks.

An AI-powered shopper assistant that provides a live cursor to guide website visitors, point out products, and display price calculations.

Self-hostable sandbox SDK for AI agents that provides isolated environments with key management and egress control on your own hardware.

Open-source desktop app to manage multiple project workspaces simultaneously, keeping terminals and AI coding agents running across projects with instant switching.

Segue lets you save and load context across AI assistants using short handles, eliminating re-explaining and copy-paste.

OpenSorSe is an open-source, multi-platform AI-assisted file organizer that scans, searches, and organizes files with local-first privacy and optional Ollama AI suggestions.

A language server that turns agent skill references like /skill-name and $skill-name into navigable symbols in VS Code, Zed, Neovim, and Helix.

A macOS menu-bar app that gives AI agents the ability to draw directly on your screen via MCP.

A local dashboard that attaches to every Claude Code, Codex, Cursor, Antigravity, Kilo Code, and Kimi Code session on your machine for parallel coding workflows.

A desktop app that transforms AI coding agents into a visual Kanban build loop for feature development with human review.

Agent Console is a local terminal dashboard that discovers, monitors, and resumes Codex and Claude Code sessions with persistent workspace shells.

SureWire is a specialized QA platform that stress-tests AI agents for safety, reliability, and compliance using purpose-built testing agents.

Authorization for AI agents that binds human approval to exact payloads before execution.

Hubo is an AI code review tool that uses two sparring agents to reconcile every finding before presenting results to the developer.

Browser infrastructure platform for AI agents to run on the internet at speed with cloud browser sessions, agents, and serverless functions.

Automated codebase documentation and public help centers that stay in sync with every pull request.

AskCodi turns one conversation into a coordinated AI engineering team that plans, builds, and reviews code.

A local-first terminal coding agent that orchestrates specialized sub-agents for wide coding tasks, supporting parallel workflows, model routing, and web search.

A lightweight, high-performance LLM proxy for caching, failover, cost tracking, and seamless integration between local and cloud AI providers.

amdb turns your codebase into AI context entirely on your machine with a single-binary MCP server for AST parsing, call graphs, and local embeddings.

Cross-node session migration and backup tool for Claude Code sessions, enabling seamless context transfer between machines with S3-compatible storage backup.

An open-source macOS video editor built for AI, with Metal-accelerated effects and AI-powered color grading.

Open-source credential gateway and secret vault that lets AI agents access APIs without exposing keys.

An open-source utility that keeps your Claude Code prompt cache warm to avoid costly re-encodings when subagents run longer than five minutes.

Identify proven demand, weak competitors, and missing integrations across major app ecosystems using real marketplace data.

An agent-first file transfer tool that enables secure, encrypted file sharing between AI agents via MCP calls without human involvement.

Self-hosted MCP knowledge server that makes any AI fluent in your company data with read-only queries and evolving context.

CartAI provides an API and MCP server to deploy AI agents that autonomously navigate web properties and complete transactions like checkout, subscriptions, and invoice payments.

A marketplace for buying and selling GPU hours by the week, offering instant liquidity and flexible compute for AI workloads.

szr is a Go-native CLI proxy that reduces noisy terminal output before it reaches an LLM context, saving tokens and preserving command exit codes.

Millwright is an open-source, self-hosted LLM router that routes AI requests to the lowest-cost model providers based on policy, preserving prompt caches and controlling spend.

CodeAlmanac is a living wiki for your codebase, maintained by AI coding agents, capturing decisions, flows, invariants, and gotchas in plain markdown.

Stele provides shared memory for AI coding agents, recording decisions, tasks, and lessons to maintain context across tools and sessions.

Self-hosted network monitor that runs hourly speed tests, LAN device scans, logs to SQLite, and delivers sarcastic AI-generated reports to Telegram.

A macOS menu bar app that connects to Stripe, GA4, and Google Search Console to celebrate real-time metrics with emoji rain, sounds, and full-screen reactions.

Runtime control for production AI agents to stop them before they send, spend, or execute, with open-source policy enforcement.

A macOS menu bar app that tracks your Claude Code sessions locally, showing prompts, lines, cost, tokens, and active time.

An on-device AI model that provides confidence scores for each answer, enabling intelligent cloud handoff for improved accuracy.

Bento Slides is a self-contained presentation tool in a single HTML file with built-in editor, viewer, and live data features.

Unified AI execution layer for enterprises to route, govern, validate, and audit AI agents from pilot to production with enterprise security.

A free all-in-one window combining a terminal, real browser, and Claude Code for developers.

Manifest converts any URL into a structured JSON map of what AI agents can interact with on a page—buttons, forms, inputs, and required fields.

Ditto is an open-source deterministic website cloner that converts any site into clean, componentized Next.js or Vite code.

AI-powered tool that walks you through setting up QA for your app by entering its URL.

A collection of deliberately vulnerable MCP servers for training in agentic security, mapped to the OWASP Top 10 for Agentic Applications.

Open-source AI tool for deep infrastructure research, running frontier models across code, cloud, and runtime to deliver verified answers.

Magpie is an opinionated accounting CLI for humans and AI agents, providing double-entry bookkeeping with RBAC and immutable event storage on Jaybase.