Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
Game Development
Q&A for professional and independent game developers
Stack Overflow
Q&A for professional and enthusiast programmers
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Server Fault
Q&A for professional system and network administrators
User Experience
Q&A for user experience researchers and experts
WordPress Answers
Q&A for WordPress developers and administrators
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Mathematics
Q&A for people studying math at any level and professionals in related fields
Writers
Q&A for authors, editors, reviewers, professional writers, and aspiring writers
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Japanese Language & Usage
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Japanese language
Robotics
Q&A for professional robotic engineers, hobbyists, researchers and students