Slushy_ Plays Ace of Spades a Free Multiplayer FPS Set in a Destructible Voxel World
The original Voxel FPS that let's you build and destroy defences while trying to capture the enemies intel. There a few game modes,it's free and the servers are solid. Get it here http://www.ace-spades.com/
This video is of Beta version 0.75
(If you want to jam on some multiplayer , add me on Skype - peter romeo ) :)