The Great Buildings Collection
database of architectural web resources (English)

Nicolas Janberg's Structurae
international database of architectural and engineering structures (English/German/French)

archistructura
Knowledge construction site for learning and research resources at the Vienna University of Technology (German/English)

Architekturzentrum Wien
the architecture center of Vienna (German/English)

BauNetz
comprehensive web resources for builders and designers (German)

Sólo Arquitectura
architectural resource collection (Spanish)