SpringLobby is a free cross-platform lobby client for the "Spring RTS":http://springrts.com project.
We warmly encourage you to:
We would like to fix our OSX-specific bugs but none of the current devs have a mac, so we need a volunteer to maintain mac builds and fix few glitches. If you have some knowledge of c++ and are willing to contribute, don't hesitate to contact us! Also see MacOS for what we know already.