Stack Overflow
Q&A for professional and enthusiast programmers
Code Review
Q&A for peer programmer code reviews
Super User
Q&A for computer enthusiasts and power users
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Music Fans
Q&A for music historians, critics, and fans
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Graphic Design
Q&A for Graphic Design professionals, students, and enthusiasts
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
Server Fault
Q&A for system and network administrators
Video Production
Q&A for engineers, producers, editors and enthusiasts spanning the fields of video and media creation
Mathematics
Q&A for people studying math at any level and professionals in related fields