Adventure Game Studio is a cool game engine that allows you to build fast adventure games (like Monkey Island). The tools are quite advanced, and they are easy to use; there’s a bunch of games created with AGS by enthusiasts.
The good news? Now it’s open sourced – a great moment for it to improve. People have starting (Bero from ArkLinux, more exactly), and hopefully pretty soon we’ll have also new features and new ideas.
So if you have nothing to do, you’re a programmer, you love adventure games and you have nothing else to do… Hack away! If you’re not a programmer, then check some of the games created – and recommend some if you find very good ones 🙂