Zbaron

Well worth the bundle they were in !
Hoard - Top Down, Dragon Hoarding ! Lots of gameplay. (10) Indiedb.com
Diety - FREE 3rd person, Diablo feel, great new approach ! Want more levels! (10) Indiedb.com
Lair of the Evildoer - Top down cartoon shooter, good for a once through. (7) Indiedb.com

I will add more above as I play them.

Games I am interested for me (+'s are my research, # is Desura rating)

Red Eclipse (Desura - FREE FPS) ++++ 9.2
Tank War (Desura - FREE) + 7.4
Smokin' Guns (Desura - FREE FPS) ++ 8.6
Xonotic (Desura - FREE FPS) ++++ 9.2
Open Arena (Desura - FREE FPS) 7.4
Warzone 2100 (Desura - Free RTS) 9.4 Single Player
Seven Kingdoms: Ancient Adversaries (Desura - Free RTS) 9.2 (Better than AoE)

Games for 5 yro
Marble Arena 2 (Desura - Free) 7.9Speed Dreams (Desura - FREE Racing) (Appears Broken now)
Neverputt (Desura - FREE Golf) 6.7