Ragflow

RAGFlow is an open-source retrieval-augmented generation engine that treats RAG and agent capabilities as one context layer for LLMs rather than two separate stacks. Documents move through a converged parsing and indexing path, and pre-built agent templates cover the common shapes so a pipeline does not start from an empty file. It is written mostly in Go, licensed Apache-2.0, and has passed 88,000 stars. A hosted version runs at ragflow.io for anyone who would rather not operate it. Recent releases added agent memory, DeepSeek v4 support, and chat channels for Feishu, Discord, Telegram and Line.