I think these are the universities in Germany offering MS in Information Systems. Have a look on it.

List of Information Systems Universities in Germany

Braunschweig University of Technology
University of Technology
University of Erlangen-Nürnberg
RWTH Aachen University
University of Tübingen
University of Freiburg
University of Augsburg
University of Erlangen-Nürnberg
Chemnitz University of Technology

Here is the list of Universities in Germany for MS in Information Systems:

Braunschweig University of Technology
University of Technology
University of Erlangen-Nürnberg
RWTH Aachen University
University of Tübingen
University of Freiburg
University of Augsburg
University of Erlangen-Nürnberg
Chemnitz University of Technology

Here I have listed the names of the Universities in Germany which offers MS in Information Systems-

University of Erlangen-Nürnberg
RWTH Aachen University
University of Tübingen
Braunschweig University of Technology
University of Technology
Chemnitz University of Technology
University of Freiburg
University of Augsburg
University of Erlangen-Nürnberg

List of Universities in Germany for MS in Information Systems-

WINGS - WISMAR UNIVERSITY OF APPLIED SCIENCES
SAARLAND UNIVERSITY, EDUCATIONAL TECHNOLOGY (EDUTECH)
UNIVERSITY OF FREIBURG, FACULTY OF APPLIED SCIENCE
EIT ICT LABS MASTER SCHOOL
UNIVERSITY OF TECHNOLOGY
CHEMNITZ UNIVERSITY OF TECHNOLOGY