There's too many to name. Here are all the bands that are in my collection.
NOTE: Some Visual Kei bands have become J-Rock bands, but I'll just put them under Visual Kei anyway.
Dir en grey
The Candy Spooky Theatre
Moi Dix Mois
Asian Kung-Fu Generation
BUMP OF CHICKEN
HIGH and MIGHTY COLOR
the brilliant green
Do As Infinity
Judy and Mary
little by little
Boom Boom Satellites
Attack Haus is a fusion band. Techno and J-Rock put together.
Boom Boom Satellites is a techno group that incorporates rock into their music.
Melt-Banana is a noise-rock group with a female lead.
Yoshida Brothers is a techno group that incorporates classic Japanese instuments.
All of that is in my iPod. LOL. And I'm still looking for more, but most of those bands are keepers. I recommend each and every one of them (if they suit your tastes).