There are 12 main universitarian organisms offering financiary help in Germany :

Name Link
1. Cusanuswerk Link
2. Evangelisches Studienwerk e.V. Villigst Link
3. Friedrich-Ebert-Stiftung Link
4. Friedrich-Naumann-Stiftung für die Freiheit Link
5. Hanns-Seidel-Stiftung Link
6. Hans-Böckler-Stiftung Link
7. Heinrich-Böll-Stiftung Link
8. Konrad-Adenauer-Stiftung e.V. Link
9. Rosa-Luxemburg-Stiftung Link
10. Stiftung der Deutschen Wirtschaft Link
11. Studienstiftung des deutschen Volkes e.V. Link
12. Ernst Ludwig Ehrlich Studienwerk Link

You can find more information on these organisms here.

Which scholarship could I get ?

With the help of the Databank of Scolarship, you can find a scholarship that fits you personnaly.

For instance, with :

MyStipendium.de
Stipendienlotse.de
e-fellows.net

The Aufstiegsstipendium

The Aufstiegsstipendium supports Berufserfahrene bei der by a first academical studies.

This scholarship is a programme of the Begabtenförderung and supports people who have specific formation and work, or can prove that they have a special talent or engagement. The SBB – Stiftung Begabtenförderung berufliche Bildung is responsible of this programme, in cooperation with the Federal Minister for education and reshearch. They select the persons they will accord the scholarship to, and follows them during their studies.

You can get mor info here.