Going up a level, there is Gezira and Nile. The latter includes Maru with changes through Dec 2012. Piumarta kept committing changes to Maru through Nov 2013. piumarta.net is, sadly, unresponsive today.

So, it appears that Dan Amelang was able to capture the core of the STEPS project at github. I don't see anything about the UI or Frank, though.