Physics
Q&A for active researchers, academics and students of physics
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
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Photography
Q&A for professional, enthusiast and amateur photographers
Mathematics
Q&A for people studying math at any level and professionals in related fields
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Islam
Q&A for Muslims, experts in Islam, and those interested in learning more about Islam
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
WordPress Answers
Q&A for WordPress developers and administrators
Personal Finance & Money
Q&A for people who want to be financially literate
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Graphic Design
Q&A for professional graphic designers and non-designers trying to do their own graphic design
User Experience
Q&A for user experience researchers and experts
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Server Fault
Q&A for professional system and network administrators
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
Cognitive Sciences
Q&A for practitioners, researchers, and students in cognitive science, psychology, neuroscience, and psychiatry
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
Personal Productivity
Q&A for people wanting to improve their personal productivity
Christianity
Q&A for committed Christians, experts in Christianity and those interested in learning more