Onyx: Open-Source Self-Hosted AI Platform with 40+ Connectors, Knowledge Graphs, and Custom Agents — 29K Stars, MIT Licensed

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A YC-backed open-source AI platform that combines chat, RAG, agents, and code execution with 40+ enterprise data connectors (Google Drive, Slack, Confluence, Salesforce). Uses hybrid search (dense + BM25), AI-generated knowledge graphs, and contextual retrieval. Supports all major LLM providers including self-hosted (Ollama, vLLM) and proprietary. MIT-licensed Community Edition covers core features; deploys as a self-hosted internal AI assistant with SSO/RBAC.