Hi, I'm the main dev of usf, thanks for your replies
The sub forum is an idea we had to get a little visibility and allow less technical people to learn of the project and contribute easier to the project, because I'm not great at managing a community and talking of what we do ^^'. As you have a "hosted project" section and something like a community here
we may use that, and hoppefully pay back by getting you more attention and more people here ^^.
Anyway, the various pointer you gave are really interresting too, and I think we will try to have feedbacks and contributions from opengameart too
(although their "featured art" is far from exiting :/).
It would be possible to speak about anything, although I tend to prefer mailing lists and irc for code/debugs, forums just seems to me more fitted to artists (I may be wrong ^^).
About licences, the game code is GPL3, all graphics are CC-BY-SA, and the only musical contribution I had is CC-BY-SA-NC (wich is not *completly* free, I know, but it's the best I got from the person who offered the music).
cheers
.