Hah yes. Ill throw my own into the ring too https://github.com/boyter/cs although its a lot older than most other tools having been started 7 years ago.

Cursor was an interesting case where they were maintaining an index. I think everyone has converged on not doing that, which is where I started, with BM25 with some tweaks on top.

Notable link related to this https://www.youtube.com/watch?v=ZnmtJKFonLk where Jo Kristian Bergum (notable in the search space) agrees with BM25 being a good approach for agentic workflows.