There are also Reamonn, Die Ärzte, Die Toten Hosen, Liquido, Bonfire, H-Blockx, Oomph! and Stanfour
Other popular bands are: Alphaville, Laith Al-Deen, Sarah Connor, Glashaus, Wolfsheim, Xavier Naidoo.
But as native german its easy to know lots of Bands from here :-)