Last night we went to a gig at Kedai Kebun and briefly connected with the folks who organise Food Not Bombs and the Yogya Street Library. Very inspiring anarchists who are providing free food and lending books every Friday in central Yogyakarta.
If you can read some Indonesian, there is a great post about them here.
My understanding is that the Yogya branch is quite new, or newly active again, but the Bandung branch has been going strong for many years. There is more info about the Bandung scene here.