Top OPENAI-COMPATIBLE GitHub Repositories & Tools (2026)

OpenAI-compatible API migration kit: drop-in /v1/images/generations and chat examples, a compatibility matrix, rollback switches and a checklist for moving workloads between AI API gateways.

Ultra-lightweight, open-source, self-hosted personal AI agent framework in Python with WebUI, tools, memory, MCP, multi-agent workflows, automation, and chat apps

Open-source GEO content engineering and multi-site distribution platform with AI quality inspection, illustrated admin help, hosted sites, browser-assisted publishing, and signed updates.

Self-hosted OpenAI-compatible API for Qoder CLI login,workbuddy, with SQLite multi-account routing

Open-source local AI SDK - run AI on-device with no cloud, no API keys. Supports GGUF, RAG, image, music, and video generation, speech-to-text, P2P inference, and more. Cross-platform: Linux, macOS, Windows, Android, iOS.

The free AI already on your Mac. CLI tool, OpenAI-compatible server, and interactive chat — all on-device via Apple Intelligence. No API keys, no cloud, no downloads.

Turn CNB cloud-workspace in-network AI into production OpenAI & Anthropic (Claude Code) APIs. Zero deps, v5.2 self-healing HA, quota CLI.

Self-hosted Personal AI + agent runtime in .NET (NativeAOT-friendly)

ThunderAI is a Thunderbird Addon that uses the capabilities of ChatGPT, Gemini, Claude or Ollama to enhance email management.

The minimal interpretable model router that learns & adapts to your agent workflows

OpenAI-compatible proxy for Microsoft 365 Copilot — use the Copilot licence you already have as a backend for pi, openclaw and other coding agents. Prompt-emulated tool calling, no extra licence, no MCP.

The Conifer SDK — one gateway for cloud, local, and BYOK inference, with exact per-call cost receipts. TypeScript + Python + MCP.

Daily-updated list of free AI models (free LLM APIs), ranked by quality with live status. Plus one OpenAI-compatible endpoint that routes to the best one.