Academia
Q&A for academics and those enrolled in higher education
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
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
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Photography
Q&A for professional, enthusiast and amateur photographers
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Game Development
Q&A for professional and independent game developers
User Experience
Q&A for user experience researchers and experts
Server Fault
Q&A for professional system and network administrators
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Computer Science
Q&A for students, researchers and practitioners of computer science
Computational Science
Q&A for scientists using computers to solve scientific problems
Personal Productivity
Q&A for people wanting to improve their personal productivity
Writers
Q&A for authors, editors, reviewers, professional writers, and aspiring writers
Mathematics
Q&A for people studying math at any level and professionals in related fields