Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
User Experience
Q&A for user experience researchers and experts
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
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
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Musical Practice & Performance
Q&A for musicians, students, and enthusiasts
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Physics
Q&A for active researchers, academics and students of physics
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Server Fault
Q&A for professional system and network administrators
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
Reverse Engineering
Q&A for researchers and developers who explore the principles of a system through analysis of its structure, function, and operation
Sports
Q&A for participants in team and individual sport activities
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Windows Phone
Q&A for enthusiasts and power users of Windows Phone OS
The Workplace
Q&A for members of the workforce navigating the professional setting
Christianity
Q&A for committed Christians, experts in Christianity and those interested in learning more
English Language Learners
Q&A for speakers of other languages learning English
Academia
Q&A for academics and those enrolled in higher education