The classical titles...
 

Everyone hails and loves Worms so it got reworked/ported and it's quite amazing, totally surprised it works so great.

But what about the other good old titles from the past? Like re-volt, forsaken, descend, ...? I even heard recently that re-volt had it's total source code leaked and it still has a community that pumps out stuff for it (new version, tracks, cars...).