Physics
Q&A for active researchers, academics and students of physics
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
User Experience
Q&A for user experience researchers and experts
WordPress Answers
Q&A for WordPress developers and administrators
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Photography
Q&A for professional, enthusiast and amateur photographers
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Game Development
Q&A for professional and independent game developers
Web Applications
Q&A for power users of web applications
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Server Fault
Q&A for professional system and network administrators
Mathematics
Q&A for people studying math at any level and professionals in related fields
French Language & Usage
Q&A for students, teachers, and linguists wanting to discuss the finer points of the French language
Graphic Design
Q&A for professional graphic designers and non-designers trying to do their own graphic design
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Software Quality Assurance & Testing
Q&A for software quality control experts, automation engineers, and software testers
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
