Music: Practice & Theory
Q&A for musicians, students, and enthusiasts
Stack Overflow
Q&A for professional and enthusiast programmers
Super User
Q&A for computer enthusiasts and power users
Code Review
Q&A for peer programmer code reviews
Area 51
Q&A for proposing new sites in the Stack Exchange network
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Photography
Q&A for professional, enthusiast and amateur photographers
Server Fault
Q&A for system and network administrators
Mathematics
Q&A for people studying math at any level and professionals in related fields
Home Improvement
Q&A for contractors and serious DIYers
Graphic Design
Q&A for Graphic Design professionals, students, and enthusiasts
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Physics
Q&A for active researchers, academics and students of physics
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role