Programmers
Q&A for professional programmers interested in conceptual questions about software development
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
The Workplace
Q&A for members of the workforce navigating the professional setting
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
German Language & Usage
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Mathematics
Q&A for people studying math at any level and professionals in related fields
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Homebrewing
Q&A for dedicated home brewers and serious enthusiasts
Answers OnStartups
Q&A for entrepreneurs looking to start or run a new business
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Server Fault
Q&A for professional system and network administrators
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Game Development
Q&A for professional and independent game developers
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Signal Processing
Q&A for practitioners of the art and science of signal, image and video processing
Christianity
Q&A for committed Christians, experts in Christianity and those interested in learning more
Computational Science
Q&A for scientists using computers to solve scientific problems