Red Orchestra
Natural Selection
Garry's Mod
DOTA

More mods that have gone the commercial round.
Not really trivia though, more like common knowledge.
Advent Rising was planned to be the first game in a trilogy of games, that's slightly more trivia-like.

Ah yes, I love when people try to be smart in their "disclaimers". Makes my job so much easier ;-P. That is also why we will never see any acknowledgement of abandonware from professional companies. That would open the floodgates. Don't ask, don't tell.

Actually, on a somewhat related note, never think you are smarter than the police when being questioned. Never say anything. Honestly, never say anything. I've read files were people tried to outsmart the system and handed me the conviction on a platter. There is a reason you are allowed to remain silent....