Here is my list. Like others, there are more rpgs that I have owned, read, and never played, but these are the games that I recall actually playing at least once.
Dungeons and Dragons: Basic (Holmes), 1e, 2e, 3e
d20 Modern
Spycraft 1e
Mutants and Masterminds (1e,2e)
Boot Hill (1e ,2e)
Gamma Worlld (1e, 2e)
Star Frontiers
Top Secret
Top Secret SI
MERP
Rolemaster 2e
Rolemaster RMSS
Ghostbusters
Toon
Twilight 2000
Paladium Fantasy RPG
TMNT
Robotech
Call of Cthulu: only played once
Elric (or was it called Stormbringer): only played once
Superworld
Warhammer FRP 1e
Hero System/Champions (2e, 3e, 4e, Fanasy Hero, Robot Warriors)
GURPS 3e (Fantasy, Horror, Supers)
Star Trek (FASA)
Star Wars d6
Traveller
Marvel Super Heroes (Basic,Advanced)
Marvel Super Heroes Adventure Game
Blood of Heroes: Revised
DC Heroes (1e,2e)
Villains and Vigilantes: (Revised, Advanced/Living Legends)
Living Legends
Ars Magica 3e
Cyberpunk
Mekton
Shadowrun 1e
Legends of the 5 Rings 1e
7th Sea
Mage:The Ascension
Vampire
Made Men
Vampire LARP
Dungeons and Dragons: Basic (Holmes), 1e, 2e, 3e
d20 Modern
Spycraft 1e
Mutants and Masterminds (1e,2e)
Boot Hill (1e ,2e)
Gamma Worlld (1e, 2e)
Star Frontiers
Top Secret
Top Secret SI
MERP
Rolemaster 2e
Rolemaster RMSS
Ghostbusters
Toon
Twilight 2000
Paladium Fantasy RPG
TMNT
Robotech
Call of Cthulu: only played once
Elric (or was it called Stormbringer): only played once
Superworld
Warhammer FRP 1e
Hero System/Champions (2e, 3e, 4e, Fanasy Hero, Robot Warriors)
GURPS 3e (Fantasy, Horror, Supers)
Star Trek (FASA)
Star Wars d6
Traveller
Marvel Super Heroes (Basic,Advanced)
Marvel Super Heroes Adventure Game
Blood of Heroes: Revised
DC Heroes (1e,2e)
Villains and Vigilantes: (Revised, Advanced/Living Legends)
Living Legends
Ars Magica 3e
Cyberpunk
Mekton
Shadowrun 1e
Legends of the 5 Rings 1e
7th Sea
Mage:The Ascension
Vampire
Made Men
Vampire LARP
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