Super User
Q&A for computer enthusiasts and power users
Stack Overflow
Q&A for professional and enthusiast programmers
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Ask Different
Q&A for power users of Apple hardware and software
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Home Improvement
Q&A for contractors and serious DIYers
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Ask Ubuntu
Q&A for Ubuntu users and developers
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Server Fault
Q&A for system and network administrators
Movies & TV
Q&A for movie and TV enthusiasts
Web Applications
Q&A for power users of web applications
Information Security
Q&A for information security professionals
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Physics
Q&A for active researchers, academics and students of physics
Gardening & Landscaping
Q&A for gardeners and landscapers
User Experience
Q&A for user experience researchers and experts
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
Chinese Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Chinese language
Travel
Q&A for road warriors and seasoned travelers
Mathematics
Q&A for people studying math at any level and professionals in related fields
Chess
Q&A for serious players and enthusiasts of chess
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Arqade
Q&A for passionate videogamers on all platforms
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Aviation
Q&A for aircraft pilots, mechanics, and enthusiasts