Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
Programmers
Q&A for professional programmers interested in conceptual questions about software development
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
User Experience
Q&A for user experience researchers and experts
Game Development
Q&A for professional and independent game developers
The Workplace
Q&A for members of the workforce navigating the professional setting
Personal Finance & Money
Q&A for people who want to be financially literate
Answers OnStartups
Q&A for entrepreneurs looking to start or run a new business
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Mathematics
Q&A for people studying math at any level and professionals in related fields