Other scholarships may be available from funding agencies such as
- German Academic Exchange Service (DAAD)
- Studienstiftung des Deutschen Volkes
- via exchange programs of the universities (for example, at TU Berlin)
- via teaching assistantships (for example, at TU Berlin)

An overview of additional foundations supporting PhD students can be found here: 
http://www.begabtenfoerderungswerke.de/
http://www.stipendienlotse.de/ (in German)

Furthermore, see our lists of
institutes and of projects.