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
Homebrewing
Q&A for dedicated home brewers and serious enthusiasts
Server Fault
Q&A for professional system and network administrators
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
User Experience
Q&A for user experience researchers and experts
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Mathematics
Q&A for people studying math at any level and professionals in related fields
Web Applications
Q&A for power users of web applications
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Computer Science
Q&A for students, researchers and practitioners of computer science
The Workplace
Q&A for members of the workforce navigating the professional setting
Software Quality Assurance & Testing
Q&A for software quality control experts, automation engineers, and software testers