A long time ago, I made a fun little Roguelike game called Dungeon Crawl. I never got around to releasing it because, well, I hoped to make some shareware profits off of it, and I never got it playtested and debugged enough to the point where I felt I could charge for it.
I recently dragged it out of cold storage and decided to just to make it freely available to play on my web site. Crawl through the dungeon, slay monsters, grab gold, ponder whether those magic items will help you or splatter your brains all over the cold stone walls. What could be more fun?