Commercial games

Doom 1

 * Doom (1993)
 * Ultimate Doom (1995)

Doom 2

 * Doom II: Hell On Earth (1994)
 * Master Levels for Doom II (1995)

Final Doom

 * The Plutonia Experiment (1996)
 * TNT: Evilution (1996)

Doom 64

 * Doom 64 (1997)

Doom 3

 * Doom 3 (2004)
 * Doom 3: Resurrection of Evil (work in progress)

Heretic

 * Heretic: Shadow of the Serpent Riders (1994)

Hexen

 * Hexen: Beyond Heretic (1995)
 * Hexen: Deathkings of the Dark Citadel (1996)

Strife

 * Strife - Quest for the Sigil (1996)

Other games

 * HacX (1997)
 * Amulets & Armor (1997)
 * Chex Quest (late 1990s)