Toribash

[Soldara]

Fun little Ragdoll simulator/fighting game.

http://toribash.com/

It's a little violent... Most likely NSFW, and if you are squeamish about abstract blood, you're probably not interested.
Example of what you can do if you really get into it:

http://forum.toribash.com/vbtube_show.p ... 88&t=31330

It's kinda hard to pick up at first, but there are plenty of tutorials online. you can find them easily enough via Google.

Works on Windows, Mac OS X, & Linux. (Linux version can be found on the downloads page)

Completely free download, only have to pay if you want to customize your guy.

[Princess Guard]

I keep trying to grab the other guy and knee them in the groin, i just end up falling to the floor....

[Bloodtoes]

This game is great.. so addictive. I recommend it!

[Jenny Starfighter]

Just got it, can´t stop trying to make cool moves...