Nosia
A self-hosted Ruby on Rails platform for running AI models on your own data with an OpenAI-compatible API, retrieval-augmented generation over your documents, and Model Context Protocol integration to connect the assistant to external tools.
Nosia lets an organization run AI models against its own private documents and data with a drop-in, OpenAI-compatible API that works with existing AI applications, keeping data on the organization's own infrastructure. Beyond standard retrieval-augmented generation over PDFs, text files, websites, and question-and-answer pairs, backed by pgvector semantic search, it integrates the Model Context Protocol so the assistant can call out to external tools and services, and supports custom Agent Skills written as LLM-driven prompts or plain Ruby code.
It supports account-based multi-tenancy for isolating data between users, streams responses over server-sent events, and deploys with a single Docker Compose command; installation scripts are provided for macOS, Linux, and Windows.
It is written in Ruby on Rails and released under the MIT license, with documentation covering architecture, system diagrams, deployment strategies, and custom skill development.