GPL licensed (47)

Rise of the Triad

Also known as ROTT, Rise of the Triad: The HUNT Begins, Rise of the Triad: Dark War

First-Person Shooter, 1994
Shareware (installed), Shareware, Game expansion, Extra, FAQ

Robot Redemption

First-Person Shooter, 2014
Freeware

Rocks 'N' Diamonds

Puzzle, 1998
Freeware

Scavenger

Platform, 1996
Shareware, Full version

SimCity

Also known as SimCity Classic, Micropolis

Real-Time Strategy, 1989
Playable demo

Ski Jump International v3

Also known as SJ3

Sport, 2000
Full version

Sopwith (The Author's Edition)

Shooter, 2003
Freeware (installed), Freeware, Source code

Space Plumber

Puzzle, 1997
Freeware, Freeware, Source code

System Shock

Adventure, 1994
Playable demo, Playable demo

TecnoballZ

Arcade, 1992
Full version (installed), Full version

Triplane Turmoil

Shooter, 1996
Full version

U.R.B.A.N The Cyborg Project

Also known as URBAN, The Cyborg Project

Platform, 1999
Freeware, Source code

Vertigo

Simulation, 1995
Freeware, Freeware, Source code

Wolfenstein 3D

Also known as Wolfenstein 3-D, Wolf3D, Wolf 3D

First-Person Shooter, 1992
Shareware (installed), Shareware, Extra

XInvaders 3D

Shooter, 2000
Freeware, Freeware, Source code