Stack Overflow
Q&A for professional and enthusiast programmers
Game Development
Q&A for professional and independent game developers
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
User Experience
Q&A for user experience researchers and experts
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Server Fault
Q&A for professional system and network administrators
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Photography
Q&A for professional, enthusiast and amateur photographers
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Programmers
Q&A for professional programmers interested in conceptual questions about software development
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Ask Different
Q&A for power users of Apple hardware and software
Personal Finance & Money
Q&A for people who want to be financially literate
Writers
Q&A for authors, editors, reviewers, professional writers, and aspiring writers
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
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
Software Quality Assurance & Testing
Q&A for software quality control experts, automation engineers, and software testers
Personal Productivity
Q&A for people wanting to improve their personal productivity
Musical Practice & Performance
Q&A for musicians, students, and enthusiasts