Open source (167)

Heretic

First-Person Shooter, 1994
Shareware (installed), Shareware

Hexen II

Role-Playing, 1997
Playable demo (installed), System component, Playable demo

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 (installed), Playable demo, Playable demo, Full version, Source code

Invaders 1978

Shooter, 1996
Freeware, Freeware, Source code

Iron Seed

Adventure, 1994
Shareware, Source code

Jetpack Joe

Platform, 2002
Freeware (installed), Freeware, Source code

JTris

Puzzle, 1999
Freeware (installed), Freeware, 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

Ken-Build

Miscellaneous, 2000
Freeware (installed), Freeware, Extra

Kentris

Puzzle, 1991
Freeware