I′ve played a few though most of them were shareware. They′re still fun to play because they are so simple and thankfully I still have the old Compaq to play them on

I won′t talk in-depth about any of them but these are the ones I′ve played:

CyClones (complete version)

Chasm: The Rift (demo)

Doom (demo)

Duke Nukem 3D (complete version)

Wolfenstein 3D (demo)

Bad Toys (demo)

Nitemare 3D (demo)

If I remember more I′ll add them. So what games have you played?

http://en.wikipedia.org/wiki/CyberMage:_Darklight_Awakening, http://en.wikipedia.org/wiki/Star_Wars:_Dark_Forces and http://en.wikipedia.org/wiki/William_Shatner just to mention the few.

While the FPS back then florished on the DOS platform, there were others as well, like http://en.wikipedia.org/wiki/Alien_Breed_3D (and sequel) for the Amiga.

Along with Doom 1 & 2, I played Heretic and Hexen, and Quake 1 & 3: Arena. I liked the simplicity of those old games. Also, Doom had quite a modding community that created many interesting maps for the games.

Shattered steel was a good one. I think it was made by Bioware.