Assassin's Creed - PC (disc), PC (Uplay/Ubisoft Connect), PC (Steam)
Assassin's Creed 2 - PS3, PC (Uplay/Ubisoft Connect), PC (Steam)
Assassin's Creed: Brotherhood - PS3, PC (Uplay/Ubisoft Connect), PC (Steam)
Assassin's Creed: Revelations - PS3, PC (Uplay/Ubisoft Connect), PC (Steam)
Assassin's Creed 3 - PS3, PC (Uplay/Ubisoft Connect), PC (Steam)
Assassin's Creed IV: Black Flag - PS3, PC (Uplay/Ubisoft Connect), PC (Steam)
Assassin's Creed: Rogue - PS3, PC (Uplay/Ubisoft Connect), PC (Steam)
Assassin's Creed: Unity - PS3, PC (Uplay/Ubisoft Connect), PC (Steam)
Assassin's Creed: Syndicate - PS3, PC (Uplay/Ubisoft Connect), PC (Steam)
Assassin's Creed: Origins - PS4, PC (Uplay/Ubisoft Connect), PC (Steam)
Assassin's Creed: Odyssey - PS4, PC (Uplay/Ubisoft Connect), PC (Steam)
Dragon Age: Inquisition - Xbox One, PC (Origin), PC (Steam)
Far Cry 3 - PS3, PC (Uplay/Ubisoft Connect), PC (Steam)
Final Fantasy Tactics - PSX, PSP, Android, PC (if it ever gets ported)
Final Fantasy I - PSX, Android, PC (mobile port), PC (Pixel Remaster)
Final Fantasy II - PSX, Android, PC (mobile port), PC (Pixel Remaster)
Final Fantasy III - PSX, Android, PC (mobile port), PC (Pixel Remaster)
Final Fantasy IV - PSX, Android, PC (mobile port), PC (Pixel Remaster)
Final Fantasy IV: The After Years - PSX, Android, PC (mobile port), PC (Pixel Remaster)
Final Fantasy V - PSX, Android, PC (mobile port), PC (Pixel Remaster)
Final Fantasy VI - PSX, Android, PC (mobile port), PC (Pixel Remaster)
Final Fantasy VII - PSX, PS3, Android, PC
Final Fantasy VIII - PSX, PS3, Android, PC (2013), PC (2019)
Final Fantasy IX - PSX, PS3, Android, PC
Final Fantasy X/X-2 - PS2, PS3, PS4, PC
Final Fantasy XII - PS2, PS4, PC
Final Fantasy XIII - Xbox 360, PS3, PC
Halo: Reach - Xbox 360, Xbox One, PC
Halo: Combat Evolved - Xbox 360, Xbox One, PC
Halo 2 - Xbox 360, Xbox One, PC
Halo 3 - Xbox 360, Xbox One, PC
Halo 4 - Xbox 360, Xbox One, PC
Mass Effect - Xbox 360, PC (original port), PC (Legendary Edition)
Mass Effect 2 - Xbox 360, PC (original port), PC (Legendary Edition)
Mass Effect 3 - Xbox 360, PS3, PC (Legendary Edition)
Star Ocean: The Last Hope - Xbox 360, PS3, PC
Games I have only purchased twice, but will immediately purchase a third time if they ever get a Steam PC port:
Dark Cloud 2 - PS2, PS4, PC
Dragon Age: Origins - PS3, PC (Origin), PC (Steam)
Grand Theft Auto III - PS2, PC (original port), PC (Remastered)
Grand Theft Auto: Vice City - PS2, PC (original port), PC (Remastered)
Legend of Dragoon - PSX, PS3, PC
Lost Odyssey - Xbox 360, Xbox One, PC
Metal Gear Solid - PSX, PS3, PC
Ratchet and Clank - PS2, PS4, PC
Star Ocean: Till the End of Time - PS2, PS4, PC
The Last Remnant: Xbox 360, PC (original port), PC (Remastered)