Holy shit the amount of cartoons I watched in my childhood and adolescence (and still watch) could definitely go on forever but here are some to name a few:
Spongebob
Rugrats
TMNT (2003)
Winx Club
Kim Possible
American Dragon: Jake Long
Static Shock
Teen Titans
Code Lyoko
Totally Spies
Ozzy & Drix
Ed, Edd, n Eddy
Codename: Kids Next Door
The Grim Adventures of Billy & Mandy
Justice League (Original and Unlimited)
If anime counts:
Dragon Ball Z
Naruto
Bleach
One Piece
InuYasha
Yu-Gi-Oh (Original, GX, and 5D's)
Yu Yu Hakusho
Devil May Cry: The Animated Series
Peach Girl
Suzuka
NANA
Sonic X
Pokemon
Maburaho
Eureka Seven
Ninja Nonsense
Full Metal Alchemist
Zatch Bell