Hey.
One of my older Java games has found its way to Gamersgate: http://www.gamersgate.com/DD-RBS/room-boom-suburbia-pc
It’s a puzzle / strategic board game hybrid, centered around house building, where you can play either up to 4 human players, or against AI players.
Made in vanilla Java and Swing, it’s hardly a technical masterpiece, but the gameplay is innovative and varied. 
Here’s a video they don’t link to:
Cheers,
Rickard