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fess
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fess

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.

by codelibs · GitHub
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ai-searchcrawlerdockerApache-2.0JavaSelf-hostable
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In plain words

Set up a search server to find documents across websites, files, and databases on your own platform.

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📈 Star history
1 1201 119
2026-07-202026-08-31
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📄 About

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 has 1.1k stars on GitHub. It has been forked 174 times. fess is written mainly in Java. It has been in active development since 2013. fess is available under the Apache-2.0 license. Its main topics are ai-search, crawler, docker, elasticsearch.

Frequently asked questions

What is fess?

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.

Is fess open source?

fess is an open-source project. It is released under the Apache-2.0 license.

Is fess free?

Yes. fess is free and open source — you can use, modify and self-host it.

What license does fess use?

fess is available under the Apache-2.0 license.

What language is fess written in?

fess is written mainly in Java.

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