Programmers
Q&A for professional programmers interested in conceptual questions about software development
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Answers OnStartups
Q&A for entrepreneurs looking to start or run a new business
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
User Experience
Q&A for user experience researchers and experts
Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
Physics
Q&A for active researchers, academics and students of physics
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
Mathematics
Q&A for people studying math at any level and professionals in related fields
Photography
Q&A for professional, enthusiast and amateur photographers
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Server Fault
Q&A for professional system and network administrators
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Stack Overflow
Q&A for professional and enthusiast programmers
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
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
Web Applications
Q&A for power users of web applications
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Writers
Q&A for authors, editors, reviewers, professional writers, and aspiring writers
