A virtual gaming tabletop
Single-/multi-player card game Mau Mau (similar to UNO®)
Seahaven, often called Freecell,solitaire
tichu replayer
Easy YGOPro puzzle editor
A Java Belote card game in french
Baby contract bridge game
Santase - Sixty-six/Schnapsen card game
SkipBo! server and Qt client
Just another online poker software, but open source for once.
Famous Russian card game
Glues together MSE/Cockatrice/MWS, etc