Hello, Don't know if there are "official open sources projects" on plan9, but anyway there's definitively very interesting thinks to be done on plan9.
Raspberry Pi and plan9 is a good combination. Richard Miller has ported plan9 to raspberry, and you can find some people adding new drivers to it. Chek out this formum. Some softs that I would like to see running on plan9 : - enhanced bc calculator like the gnu one, - heirloom troff from Gunnar Ritter...
