Stack Overflow
Q&A for professional and enthusiast programmers
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Mathematics
Q&A for people studying math at any level and professionals in related fields
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Server Fault
Q&A for professional system and network administrators
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Graphic Design
Q&A for professional graphic designers and non-designers trying to do their own graphic design
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs