Open source (163)

TerraScape - Breakdown Velocity

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

Tetris (Alchemic)

Puzzle, 2004
Freeware

Tetris (Johan Peitz)

Puzzle, 1997
Freeware, Source code

Tic-Tac-Toe

Traditional, 2014
Freeware

Triplane Turmoil

Shooter, 1996
Full version

Twinsen's Odyssey

Also known as Little Big Adventure 2, LBA 2, Relentless 2

Adventure, 1997
Playable demo

Velena

Traditional, 1997
Freeware, Source code

Vertigo

Simulation, 1995
Freeware (installed), Freeware, Source code

Vitetris

Puzzle, 2008
Freeware, Source code, Freeware

Vlak

Arcade, 1993
Freeware, Source code, Freeware

WetSpot 2

Also known as Wetspot 2, WetSpot II

Arcade, 1997
Freeware, Editor, Game expansion

Wolfenstein 3D

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

First-Person Shooter, 1992
Shareware (installed), Shareware, Source code, FAQ, Preview

WorDOS

Puzzle, 2022
Freeware, Source code

WorDOSle

Also known as WOR-DOS-LE

Puzzle, 2022
Freeware (installed), Freeware, Source code

Xargon

Also known as Xargon: Beyond Reality

Platform, 1993
Full version, Source code, Editor

XInvaders 3D

Shooter, 2000
Freeware, Freeware, Source code