World

"Look again at that dot. That's here. That's home. That's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives." — Carl Sagan

Everything.

Arts

• List of architecture databases
• List of monument databases
• List of movie databases
• List of book databases
• List of music databases

Geography

• List of geographic databases
• List of Reddit subs by country and territory
• List of Twitter hashtags by country and territory

GLAM

Galleries, Libraries, Archives and Museums.

• ArchiveGLAM
• List of knowledge projects
• Knowledge preservation initiatives

Language

• List of Reddit subs by language
• List of Twitter hashtags by language

Science

• List of astronomical databases
• List of chemistry databases
• List of diseases databases
• List of species databases

Technology

• List of hardware databases
• List of software databases
• List of patents databases