Quite a lot - I'll only list a few here, though, as I've been into anime and manga since 1975:
Mahou Sensei Negima
Love Hina
A I Love You
Ai Yori Aoshi
Rurouni Kenshin
Ah! My Goddess
No Need for Tenchi
Magic Knight Rayearth
Angelic Layer
Chobits
Card Captor Sakura
Record of Lodoss War (most adaptations)
And many more
