Osnabrück
Dart and music pub with beer garden. Open 17.00 - 01.00 Uhr (closed on Wednesday). They'll play cool 80s Metal if Metalheads are there, so don't be surprised if you hear different music (Rock, probably) when entering.
A nightclub where they have some Metal evenings (not every day, but its a lot of Gothic and Alternative stuff as well - just check their website). They are also holding are a lot of Metal and Rock gigs. Open Wednesday - Saturday from 22.00 on.
Nightclub which has a different Metal nights on many Fridays and also some Metal gigs. Check out their website for details about upcoming events.