Stack Overflow
Q&A for professional and enthusiast programmers
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Super User
Q&A for computer enthusiasts and power users
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Q&A for project managers
Area 51
Q&A for proposing new sites in the Stack Exchange network
User Experience
Q&A for user experience researchers and experts
Seasoned Advice
Q&A for professional and amateur chefs
Mathematics
Q&A for people studying math at any level and professionals in related fields
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Software Quality Assurance & Testing
Q&A for software quality control experts, automation engineers, and software testers
Code Review
Q&A for peer programmer code reviews
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Travel
Q&A for road warriors and seasoned travelers
Information Security
Q&A for information security professionals
Server Fault
Q&A for system and network administrators
Web Applications
Q&A for power users of web applications
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle