OpenLieroX

OpenLieroX is a free open-source worms shoot-em-up game. It'll work on pretty much any operating system, including Mac OS, Windows and Linux. You can download it here. The download is coming with over 60 different levels and also has a multiplayer in it.

GameMaker

Would you like to make your own games for free? Then you will be interested in GameMaker. With GameMaker you can create your own games easily. It's even possibly to create games in 3D. You can download GameMaker here for free. Registering an account is not needed.

TypeRacer

Do you think you can type real fast? Do you want to compete against your friends in typing? It's possible on typeracer.com. On this website you can decide to train or immediately compete against others. You can also invite a friend to compete against him.