trying to throw the weekly lan party/games and i need a 100% free good multiplayer game

can anyone help out here? played america's army to death!

starts in 3 hours!

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"IT IS WHAT IT IS"

AMD 64 3700+ * 2GB (4x512) HyperX DDR500 * DFI LANPARY EXPERT * 5x80 Barracuda SATA Raid5 * 2 BFG 7800GTs in SLI * HP DVD-RW 630e * Lite-on DVDrom x16 *