Open-source projects in AI Tools & LLM Clients that exist because someone reverse engineered a closed product. Most-starred: claw-code, system-prompts-and-models-of-ai-tools, system_prompts_leaks, gpt4free, CLIProxyAPI.
Search and filter this category →Clean-room Rust/Python rewrite of the Claude Code agent harness after the source leak
Wraps Codex, Claude Code, Antigravity, Grok and Gemini CLI OAuth backends as OpenAI/Claude-compatible APIs
Relay that exposes Claude, OpenAI, Gemini and Grok subscriptions as unified APIs
Proxy that routes Claude Code's Anthropic API traffic to other model providers
Antigravity account manager with local OpenAI/Anthropic/Gemini proxy
Reverse-engineered rebuild of the Anthropic Claude Code CLI as an open terminal coding assistant
OpenCode plugin authenticating against Antigravity to use its Gemini/Claude quota
Claude Code 2.1.88 TypeScript source restored from sourcesContent in the leaked cli.js.map
Multi-protocol proxy for Antigravity, Codex, Grok, Kiro and Claude client backends
Converts Gemini CLI and Antigravity credentials into OpenAI, Gemini and Claude APIs
Reverse-engineered third-party provider APIs giving free access to GPT-4 and other LLMs
Reverse engineered ChatGPT web API client in Python (archived)
Unofficial NotebookLM Python API/CLI built on its undocumented internal RPC protocol
Multi-account API gateway for Grok Web, Grok Build and Grok Console
Reverse engineered API of Microsoft's Bing Chat (Sydney) AI
TypeScript replication of gpt4free reverse-engineered free GPT-4 provider API
Pure-protocol reverse implementation of ChatGPT web incl. GPT-Image-2, OpenAI-compatible
OpenClaw using Claude/ChatGPT/Gemini/DeepSeek/Doubao web sessions, no API token
Unofficial Python package returning Google Bard responses via cookie value
Python client for the unofficial ChatGPT web API
MCP server for Xiaohongshu (RedNote): login, publish, search, comment
WhatsApp MCP server built on whatsmeow web multidevice protocol
CLI and MCP server for Gemini Notebook (NotebookLM) via its internal RPC API
LinkedIn MCP server for profiles, companies, jobs and messages via browser session
MCP server letting agents query Google NotebookLM with citations
Slack MCP server that can use browser session tokens and the undocumented Slack Edge API
MCP server for Garmin Connect data via unofficial API
MCP server for publishing and managing Xiaohongshu creator content from AI clients
Douyin MCP extracting watermark-free video links and transcripts
MCP server for WeChat Read (WeRead) shelf and notes
Proxies Midjourney's Discord channel to provide an HTTP API for image generation
Unofficial self-hostable REST API for Suno music generation via its internal endpoints
Reverse-engineered Google Flow API for Nano Banana Pro and Veo generation
Unofficial Node.js Midjourney client over Discord
Unofficial Suno music generation API
Reverse-engineered Sora web API with account pool
Reverse-engineered Jimeng/Dreamina text-to-image, image-to-image and video API
Midjourney Discord API wrapper as REST service: imagine, upscale, variation, describe
Midjourney Discord proxy exposing an image generation API
OpenAI-compatible TTS API mirroring the free openai.fm service
Open-source reimplementation of Google Tensor Processing Unit (TPU) hardware
Messenger browser extension acting as an unofficial API for Meta Ray-Ban glasses
Self-hosted transcription interface for Plaud Note recordings
Reverse engineering of Google's Gemma 3n edge-optimized model architecture
Turns the OpenAI Dot device into an OpenAI- and Claude-compatible API
Reverse-engineered BLE protocol of Even Realities G2 smart glasses
Extracts and displays data from Windows 11 Copilot+ Recall snapshots database
LLM inference on the Apple Neural Engine
Local runtime for training and running small LLMs on the Apple Neural Engine
Reverse engineering the Rockchip RK3588 NPU
Zero-cost access to GLM, Kimi, Qwen and other models via their official web UIs
Converts the Qwen web chat into an API
QwenLM web chat to OpenAI-compatible API
DeepSeek web reverse API
Converts chat.deepseek.com web chat into OpenAI and Anthropic compatible APIs
Unofficial Python wrapper for the DeepSeek web chat
Doubao web to API with Playwright a_bogus signature reversing
Kimi web chat reverse proxy with OpenAI-compatible interface
FastAPI reverse proxy turning DeepSeek web chat into OpenAI-compatible API
Doubao web reverse API
Extracted system prompts and tool definitions for Cursor, Claude Code, Devin, Windsurf, Kiro, v0, Lovable and more
Archive of extracted system prompts from ChatGPT, Claude, Gemini, Grok and others, per vendor with history
Leaked system prompts and tool specs for ChatGPT, Claude, Gemini, Grok, Perplexity, Cursor, Lovable, Replit and others
Collection of leaked system prompts from LLM-based services, with verifiable sources
Claude Code system prompt, builtin tool descriptions and sub-agent prompts extracted per release
Collection of extracted GPT system prompts plus prompt injection / prompt leaking techniques
Curated collection of system prompts for top AI tools (v0, Manus, Claude Code, ChatGPT, Perplexity)
Chinese translation of extracted prompts from Cursor, Devin, VSCode Agent and other AI coding tools
Extracted Claude Code system prompt
Living document of the extracted Claude Code system prompt
Chinese localization patch for Claude Desktop on macOS, Windows and Linux
Repackages the Windows Claude Desktop app to run on Debian/Linux
Export ChatGPT conversation history from the web app
React components and design-system notes derived from REA investigation of the Claude app UI
Converts ChatGPT export ZIPs into Markdown with media and usage visualizations
Configures DeepSeek, Kimi, GLM and Bailian providers inside Claude Desktop
Claude Desktop Windows zh-CN patch translating keys and JS chunk labels
Open-source reimplementation of the GPTZero AI-text detector
Reverse engineered reimplementation of CosyVoice's supervised semantic speech tokenizer
Open-source implementation of the OpenCat Team server