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Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Graphic Design
Q&A for professional graphic designers and non-designers trying to do their own graphic design
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
WordPress Answers
Q&A for WordPress developers and administrators
Christianity
Q&A for committed Christians, experts in Christianity and those interested in learning more
Physics
Q&A for active researchers, academics and students of physics
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Game Development
Q&A for professional and independent game developers
User Experience
Q&A for user experience researchers and experts
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Ask Different
Q&A for power users of Apple hardware and software
Web Applications
Q&A for power users of web applications
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Server Fault
Q&A for professional system and network administrators
Mathematics
Q&A for people studying math at any level and professionals in related fields
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
Chemistry
Q&A for scientists, academics, teachers and students
Politics
Q&A for people interested in governments, policies, and political processes
Robotics
Q&A for professional robotic engineers, hobbyists, researchers and students
Computer Science
Q&A for students, researchers and practitioners of computer science
Computational Science
Q&A for scientists using computers to solve scientific problems
Software Quality Assurance & Testing
Q&A for software quality control experts, automation engineers, and software testers