cs.opensource.google runs on Google's search infrastructure, so it's unlikely to be open sourced. https://github.com/google/zoekt https://github.com/google/zoek

cs.opensource.google runs on Google's search infrastructure, so it's unlikely to be open sourced. https://github.com/google/zoekt https://github.com/google/zoekt is open source, but lacks cross-referencing, and has a more spartan UI.