Open source (181)

Purple Martians

Platform, 2001
Freeware (installed), Freeware

The Puzzle Pits

Also known as Puzzle Pits 95

Puzzle, 1995
Full version (installed), Full version, Playable demo

Quake

Also known as QUAKE: The Doomed Dimension

First-Person Shooter, 1996
Shareware (installed), Shareware, Patch, Freeware, Freeware

RA 2

Platform, 2000
Freeware (installed), Freeware

Relentless: Twinsen's Adventure

Also known as Little Big Adventure, LBA

Adventure, 1994
Playable demo, Preview

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

Rival

Also known as Rival Chess

Traditional, 1993
Shareware, Source code, Full version

Robot Redemption

First-Person Shooter, 2014
Freeware

Rocks 'N' Diamonds

Puzzle, 1998
Freeware

Rogue

Also known as Rogue: Exploring the Dungeons of Doom

Role-Playing, 1984
Freeware

Rogue Clone IV

Also known as DOS Rogue Clone

Role-Playing, 2001
Freeware, Source code

The Rustic Classics

Arcade, 2000
Freeware (installed), Freeware, Source code

Scavenger

Platform, 1996
Full version (installed), Full version

Secret Legacy of the Ancient Caves

Also known as SLAC

Role-Playing, 2025
Freeware, Source code

The Secret of the Pyramid

Also known as RA

Platform, 1997
Freeware, Source code

Shadow Warrior

Also known as SW, Shadow Warrior 3D, Ninja Master

First-Person Shooter, 1997
Shareware (installed), Shareware, Update