Stack Overflow
Q&A for professional and enthusiast programmers
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Computer Science
Q&A for students, researchers and practitioners of computer science
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Martial Arts
Q&A for students and teachers of all martial arts
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
The Workplace
Q&A for members of the workforce navigating the professional setting
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Mathematics
Q&A for people studying math at any level and professionals in related fields
Server Fault
Q&A for professional system and network administrators
User Experience
Q&A for user experience researchers and experts
Game Development
Q&A for professional and independent game developers
Ask Different
Q&A for power users of Apple hardware and software
Computational Science
Q&A for scientists using computers to solve scientific problems
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Academia
Q&A for academics and those enrolled in higher education
Ask Patents
Q&A for people interested in improving and participating in the patent system