RAINBOW MASTER 188.8.131.52
That's the current baseline for all Rainbow and Cool Viewers.
Please have a look at the RELEASE_NOTES.txt and ChangeLog.txt for included changes and patches.
This is the first upload to github and I'm still figuring out how it works :).
Rainbow Viewer - a metaverse viewer for Secondlife and OpenSims based on Linden Lab's SL client