General Advice

ZEIT CAMPUS Guidebook Doctorate A well-researched, comprehensive brochure - online or in print. The Guidebook is a project of ZEIT CAMPUS and the non-profit Klaus Tschira Foundation (only in German, unfortunately).
Deutsche Forschungsgemeinschaft The German Research Foundation supports researchers in all stages of their research career. We offer funding for individuals, and there is room for further academic qualification in DFG-funded research projects and groups. The DFG supports different phases of your research career.
German Academic Exchange Service (DAAD) The web pages of the German Academic Exchange Service DAAD offer information on the different ways of doing a doctorate in Germany, on the requirements for admission and on financial aids Doctorate in Germany
German Education Union Social insurance for doctoral candidates (brochure of the GEW in German)
Quality Circle for Doctorates Recommendations for Doctoral Candidates and their Supervisors (QualitätsZirkel Promotion)