Mathematics
Q&A for people studying math at any level and professionals in related fields
Stack Overflow
Q&A for professional and enthusiast programmers
Physics
Q&A for active researchers, academics and students of physics
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Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Academia
Q&A for academics and those enrolled in higher education
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Computational Science
Q&A for scientists using computers to solve scientific problems
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
