Institutes at German universities and other research institutions
Research Explorer of the German Research Foundation (DFG) and the German Academic Exchange Service (DAAD)

Research facilities, disciplines and research in Germany
Research portal of the Federal Ministry of Education and Research (BMBF)

Research facilities, researchers and projects of the DFG in Germany and worldwide
GEPRIS - Database of the German Research Foundation

Research facilities, disciplines and researchers in Germany and worldwide
World of Learning

Researchers in Germany by disciplines (incomplete)
Humboldt Network Online

KISSWIN
Communication and information platform on career paths and funding opportunities for junior academics