Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Photography
Q&A for professional, enthusiast and amateur photographers
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Server Fault
Q&A for professional system and network administrators
Answers OnStartups
Q&A for entrepreneurs looking to start or run a new business
Open Data
Q&A for developers and researchers interested in open data
Computational Science
Q&A for scientists using computers to solve scientific problems
Genealogy & Family History
Q&A for expert genealogists and people interested in genealogy or family history
