# RAG

RAGFlow is an Apache-2.0 RAG engine built around DeepDoc, a neural document parser that understands tables, scans, and layouts most RAG stacks mangle. Here's how it works, what it costs, and where your data lands when you self-host it.

WrenAI is an open-source GenBI agent that turns natural-language questions into accurate SQL and charts across 12+ data sources — and it runs on your own machine with Ollama. A 5,000-word dive into its semantic layer, architecture, the self-host path, the cost, and where your data goes.

Open WebUI turns a local Ollama instance into a multi-user ChatGPT your whole household can use — with RAG, document upload, image generation, voice, functions, and a plugin pipeline. MIT-licensed, runs offline, your data never leaves the box. A 5,000-word look at installing it, tuning it, real workflows, and where your data actually goes.