Proving Grounds is a TDM modification for Natural Selection 2. It focuses on First Person combat, without the RTS elements of the full game. Currently in alpha development, the mod will eventually feature multiple modes and full customisation of characters and models. This will be updated as more media becomes available. NS2 is currently in Beta, so this mod is only accessible to those with a NS2 beta key.
Updated for NS2 Build 207 Beta. Current Issues - Aliens can select 4 upgrades, but only one sticks.