Most universities will offer the opportunity of partaking in their courses as a guest auditor. This will enable those interested to participate in the lectures and sometimes even seminars. Partaking in classes as a guest auditor usually won't require any qualifications and one can apply through the registrar's office. Some institutions will offer this opportunity free of charge for refugees.
Another option for taking up studies in Germany is through enrolling for an online program at the Kiron University. Through their program, one will complete the first two years of their undergraduate studies online and will learn German at the same time. Upon completion of all the relevant requirements one can transfer to one of their partnership campuses and complete their third year of undergraduate studies there.
The University of Applied Sciences of Lübeck has also created a program called oncampus. It is free of charge and enables students to acquire credit points by completing the classes taught online.