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Q&A for professional and enthusiast programmers
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Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
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
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Physics
Q&A for active researchers, academics and students of physics
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Game Development
Q&A for professional and independent game developers
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Server Fault
Q&A for professional system and network administrators
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
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Biology
Q&A for biology researchers, academics, and students
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
Writers
Q&A for authors, editors, reviewers, professional writers, and aspiring writers
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
