Fast Approximate Anti-Aliasing is the method by NVIDIA as a new form of FXAA that isn't the most visually advanced way for reducing jaggies but doesn't require much computing power and is able to smooth all pixels on the screen. FXAA can be implemented by either the game engine itself or as a NVIDIA driver setting (albeit then all of the screen is FXAA'ed, including menus/HUDs).
The Unvanquished game engine with its "RendererGL" now has FXAA support with about two thousand lines of new GLSL code. Last year at Phoronix we published FXAA performance benchmarks for those interested in the only mild performance hit along with other NVIDIA anti-aliasing benchmarks. The NVIDIA Linux driver itself allowed for FXAA support going back to the NVIDIA 304 series for games not offering native FXAA support.
The FXAA support came to Unvanquished with this Git commit as detected by the Phoronix-owned Anzwix.