Toribash
Run toribash

Select 'Setup' option
Then 'Options'
And mark 'Shaders' option

Note that you need a decent graphics card to run it.
Although sidvicious has done a good job of answering your question this thread may be helpful for you.

http://forums.toribash.com/showthread.php?t=214180
Thedevill:im 20 years
Thedevill:i have better to do