Text because my internet's being stuff:
Lego island (I know I talk about it a lot but it is the nostalgia king in my little nostaliga kingdom)
Hot Wheels Stunt Track Driver 1 and 2 (anybody remember those? many an hour was spent on those games)
Clone Wars (you know that 2002 game with all the vehicle driving and thule and that other cool stuff)
That one tonka space game that had the frustrating space weed path level thing ;-;
That tonka construction game that was posted earlier
Everything lego made 2005-2008 (namely exo-pods, the small racecar packs, the bionicle sets at the time and lego universe)
Roblox (I really did have some serious fun up to late 2010, also met a lot of my internet bros there)
Older versions of Gmod
Portal 1, somewhat
That's all I can think of right now.