Ultrastar Deluxe is looking for developers. Ultrastar is a multi-platform, multi-player karaoke game, developed in Pascal and Delphi. (See screenshot below.)

USDX is seeking developers (Pascal/Delphi) and release engineers (mainly windows and linux), as well as public relations managers, ie. managers for web pages, wikis and forums. More details are on the dev-blog at http://sourceforge.net/p/ultrastardx/dev-blog/. You can contact Karl-Mochael directly at karl-michael.schindler@web.de or on irc in the channel #ultrastardx on irc.quakenet.org.

You might also take a look at the ticket queue for an idea of where you might want to contribute.