Orac 
Its open source, and might give users some interesting things, out of the box.
It would be quite easy to change the Organelle display over to the Norns oled/encoder.
It’s parameter system is broadcast over OSC, so perhaps links up with the LUA layer, already runs on the rPI, just needs PD to run really.
Sorry not been following this thread in detail, been a bit busy, but technically Id envisage it as fairly straight-forward.
also i think it can be symbiotic relationship…
modules could be exchanged/developed between norns and other platforms
rPI development on orac could be boosted, e.g. Ive plans on how to make it multi-core, ‘norns developers’ could help if they wanted.
I can’t concretely port Orac to Norns (cant afford one ), but Id be willing to help/support the effort, if its contributed back into the Orac code base.
anyway, lots of ideas around Norns for now, so just one to chuck into the pot for perhaps future consideration.