Altima: I didn't play FFL3, but I had FFL2. FFL3 came out so much later I didn't pay it any attention. =x
Kanz: If you're going to mention Myth, you ought to mention Marathon as well. Halo people might appreciate its predecessor, but I'm amazed how many don't know it even exists.
OK, so...
FFL2
Final Fantasy Adventure
Marathon (1-3)
Smash TV (came up in a recent chat)
Might and Magic series (other than HoMM, obviously)
Summer Games, Impossible Mission, Jumpman and pretty much the entire Epyx catalog
Iggy's Wrecking Balls
Rad Racer
Rampage
Fix-It
(Root Beer) Tapper
Q-Bert
Rygar
Thexder
Star Trek: 25th Anniversary
Castles
Solstice
Murder on the Mississippi
Trailblazer (C64)
...and I'll stop there for now. My list could go on for a very long time depending on how hard I thought and how obscure (or not obscure) I wanted to get.