Anyone know of some fun free games?

[fix-the-spade]

Try out Dwarf Fortress: http://www.bay12games.com/dwarves/
Quite a steep learning curve, but Fun once you get into it.

Hiho, Hiho, it's off to work we BALROG!

 

[Blarkuntvhite]

http://outoforder.adventuredevelopers.com/

Out of Order

A free point and click adventure game.

It's really quite funny. And the story is pretty cool, too.

 

[Roxor]

Endgame: Singluarity is an open-source strategy game which has you playing as an AI which was accidentally created. Your goal is to survive and acquire knowledge without the humans getting too suspicious.