Combat Flight Simulator for LINUX. WW2. Network and VOIP. Open-source.
Grepolis utility
Your death sentence awaits...
Library for creating turn-based games with simultaneous moves.
Mighty 34th century meka action from TeamXbow
Proxy for games that emulates network conditions like ping and lag.
Robo Rally Boardgame clone written in Qt (single/multiplayer)
SLiteChat is a completely open source text-only IM/chat client for use