Open source (120)

Hexen: Beyond Heretic

Also known as Heretic 2

Adventure, 1995
Playable demo, Preview, FAQ

Hunchback (FireBall Software)

Platform, 1988
Full version (installed), Full version

Hypercycles

Racing, 1995
Shareware (installed), Shareware

In Pursuit of GREED

First-Person Shooter, 1996
Playable demo

Iron Seed

Adventure, 1994
Shareware, Source code

Jump 'n Bump

Also known as Jump'n'Bump, JumpnBump, Jumpbump

Arcade, 1998
Freeware, Source code, Update

Jumpman Lives!

Platform, 1991
Full version (installed), Full version, Source code, Extra

Kaos

First-Person Shooter, 2003
Freeware (installed), Freeware

Ken's Labyrinth

First-Person Shooter, 1993
Full version, Source code

Kentris

Puzzle, 1991
Freeware

Kiloblaster

Shooter, 1992
Full version, Full version, Shareware, Source code

Kingdom of Kroz II

Also known as Kingdom of Kroz 2

Adventure, 1987
Full version

Kraptor

Shooter, 2004
Freeware (installed), Freeware, Source code

Kroz (freeware release)

Adventure, 2009
Full version

Liero

Shooter, 1999
Freeware

Linley's Dungeon Crawl

Role-Playing, 1997
Freeware (installed), Freeware, Source code, Freeware