This is a sortable list of first-person shooter engines.
Early first-person shooter graphics engines
Early 1990s: wireframes to 2.5D worlds and textures
Mid 1990s: 3D models, beginnings of hardware acceleration
Late 1990s: 32-bit color, GPUs become standard
Early 2000s: increasing detail, outdoor environments, rag-doll physics
Mid 2000s: lighting and pixel shaders, physics
Late 2000s to 2010s: the approach to photorealism
2020s: 8K and high frame rates
Specialized engines/engine middle-ware
Some features may be integrated into engines. For instance for trees and foliage a special "engine" is available, SpeedTree, that does just that (or could be integrated into general engines). The Euphoria character's 3D animating engine can be used independently but is integrated in the Rockstar Advanced Game Engine and the game Grand Theft Auto IV.