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A reimplementation of Anthropic's Claude Code agent harness, currently being rewritten in Rust for memory safety. Focuses on building a better tool harness for AI agents with legal/ethical reimplementation

OpenAI's lightweight coding agent. Supports the terminal CLI, VS Code/Cursor/Windsurf IDE extensions, Codex Web, and a Codex App/desktop app experience; it can understand and modify code directly. Intro

Google's agent-first AI coding platform built around Gemini 3, the successor to Gemini CLI. Delivered as a heavily modified VS Code-based IDE (Editor and Manager views, built-in browser/terminal) and also supports terminal interaction via the `gemini` CLI. Features autonomous agents with multi-step edit/run/verify capabilities and verifiable Artifacts (plans, screenshots, recordings). Also supports Claude 5 (Fable), Claude Sonnet 4.6, Claude Opus 4.6, and GPT-OSS-120B. Intro

Mastra is an opinionated TypeScript framework that helps you build AI applications and features quickly. It gives you the set of primitives you need: workflows, agents, RAG, integrations and evals

Open Source AI Agents for your codebase in minutes. Use pre-built agents for Q&A, Testing, Debugging and System Design or create your own purpose-built agents.

An open-source framework that makes all software agent-native — auto-generates production-ready CLIs for any application via a 7-phase pipeline, enabling AI agents to control any desktop software. Supports 16+ AI agent platforms including Claude Code, OpenClaw, Codex and includes CLI-Hub for community CLI discovery.