Free games released in 1991
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Supaplex
action / action puzzle
Think!Ware Developement
1991 
Scorched Earth
strategy / artillery
Wendell Hicken
1991 
Ultima Worlds of Adventure 2: Martian Dreams
RPG / old school RPG
Origin Systems
1991 
ZZT
action / action puzzle
Epic MegaGames
1991 
Mad TV
simulation
Rainbow Arts
1991 
SkiFree
action / arcade
Chris Pirih
1991 
SlothMUD
RPG / MUD
SlothMUD community
1991 
TV Sports: Boxing
action
Cinemaware
1991 
Armageddon
RPG / MUD
Armageddon community
1991 
Cover Girl Strip Poker
card game / strip poker
Emotional Pictures
1991NSFW 
Dark Ages
platformer
Scenario Software
1991 
Bananoid
action
Banana Development
1991 
Strip Poker 3
card game / strip poker
Artworx Software
1991NSFW 
Arctic Adventure
platformer
3D Realms
1991