Bus Companies in Germany - German Bus Transportation
Eurolines - Germany
Eurolines will take you to many places both inside and outside Europe. Major city to city fares can be quite inexpensive when compared to train travel.
Berlin Linien Bus
Get to Hamburg, Munich, London and other destinations within Germany. In German.
Deutsche Touring CmbH - Eurolines - International Bus Travel
In English. Deutsche Touring makes over 500 stops in 33 European countries. You can book travel online.