Stack Overflow
Q&A for professional and enthusiast programmers
User Experience
Q&A for user experience researchers and experts
Game Development
Q&A for professional and independent game developers
Code Review
Q&A for peer programmer code reviews
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Mathematics
Q&A for people studying math at any level and professionals in related fields
Server Fault
Q&A for system and network administrators
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Ask Different
Q&A for power users of Apple hardware and software
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Graphic Design
Q&A for Graphic Design professionals, students, and enthusiasts
Software Recommendations
Q&A for people seeking specific software recommendations
Super User
Q&A for computer enthusiasts and power users