Any self-hosted open source projects for RAG on source code?

Does anyone know of any active projects to do RAG on source code? probably would be AST based chunking with summaries.

There is Greptile

https://greptile.com/

It’s a SaaS platform from a startup with a lot of the features that would be useful.

But I’d be much more interested in open source projects with similar goals with possibility to contribute to development of.