[ Thanks to Richard R.
Cahilig for this link. ]
“2. Alien Arena: Alien Arena is a free, stand-alone first-person
shooter computer game based on source code released by id Software.
The game runs on the CRX engine, and features modern effects such
as real-time lighting and shadows, shaders, light bloom, reflective
surfaces and much more, while still being able to run on even
modest systems. The game includes a built in, as well as external
server browser and chat client. Players can look up their stats
online, chat with other players, and become part of a growing
community. The Alien Arena experience is now a finely tuned, highly
polished body of work. Alien Arena has transformed into a lean,
clean, fragging machine, with stunning visual effects that are
usually reserved for commercial titles.“3. America’s Army:
America’s Army is a free 3D tactical shooter
game developed by the U.S Army and released as a global public
relations initiative to help with recruitment. With a greater
emphasis towards realistic combat and teamwork,
America’s Army is a popular game now enjoyed by
players around the world.America’s Army provides players with a
authentic military experience, from exploring the development of
Soldiers in individual and collective training to their deployment
in simulated missions in the War on Terror.”