Open-source, self-hosted enterprise & site search server built on OpenSearch. Crawls web / file / DB / cloud sources, 20+ languages, REST API, and AI/RAG & semantic search. Apache-2.0.
Fess is a self-hosted search server that gathers content from websites, files, databases, cloud storage, and other sources so people can search it through a web interface or REST API. Organizations use it for enterprise search and for adding searchable content to their own websites. The catalogue item provides project guidance.
Latest release fess-15.9.0 — Fess 15.9.0 · 15 Oct 2026
1 file for Claude Code: fess CLAUDE.md — 1,421 tokens loaded in every session.
CLAUDE.md A 1,421 tok These files are codelibs/fess's own configuration — they tell Claude Code how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.