Job boards
Many of the websites listed here allow you to subscribe to an email distribution list. The links may lead to webpages written in German, nevertheless, the offers may not only be for German speakers.
PhD positions and scholarships
German Academic Foreign Service
Positions at universities and research institutions (general)
universitoxy (Offers for German-speaking countries)
AkademischeStellen (Angebote für den deutschsprachigen Raum)
FacultyVacancies (offers worldwide)
WissenschaftlicheStellenangebote (offers worldwide)
Job boards for academics (not exclusively university)