If you have a low GPA and want to be considered by any German university, then make sure you have a good
A good motivation letter
Expereince letter
Copies of all relevant certificates
A school diploma/degree programme certificate(s)
Overview of the applicant’s modules
A good language proficiency proof.
But if you have a good record of the above-listed qualities, then the following German Universities may accept you even with a low GPA:
University of Greifswald
Hannover Medical School
University of Kaiserslautern
Ilmenau University of Technology
University of Kassel
Jacobs University Bremen
University of Oldenburg
Leuphana University Lüneburg
University of Magdeburg
Universität zu Lübeck
University of Mannheim
Goethe University Frankfurt
University of Passau
FAU Erlangen-Nürnberg
University of Cologne
Friedrich Schiller University Jena
Ulm University
University of Münster
Johannes Gutenberg University Mainz
University of Siegen
Note: there are many other universities in Germany that are not listed here that may accept graduates with low GPAs for masters as long as they meet the requirements.