Stifterverband provides an overview of the German foundation landscape. Many foundations managed by the German Foundation Center (DSZ) support individual projects, offer prizes, award scholarships or provide publication grants. Use the search function to find foundations that offer funding in your area.
Numerous foundations also support research projects by awarding grants and fellowships for doctoral projects, for example, or as conference or publication grants. A great tool for finding the right fellowship is the myStipendium platform.