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Programmers
Q&A for professional programmers interested in conceptual questions about software development
Photography
Q&A for professional, enthusiast and amateur photographers
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
User Experience
Q&A for user experience researchers and experts
Game Development
Q&A for professional and independent game developers
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Drupal Answers
Q&A for Drupal developers and administrators
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
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
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Physics
Q&A for active researchers, academics and students of physics
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Server Fault
Q&A for professional system and network administrators
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Ask Different
Q&A for power users of Apple hardware and software
WordPress Answers
Q&A for WordPress developers and administrators
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
German Language & Usage
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Japanese Language & Usage
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Japanese language
Graphic Design
Q&A for professional graphic designers and non-designers trying to do their own graphic design
Homebrewing
Q&A for dedicated home brewers and serious enthusiasts
Answers OnStartups
Q&A for entrepreneurs looking to start or run a new business
Software Quality Assurance & Testing
Q&A for software quality control experts, automation engineers, and software testers
Personal Finance & Money
Q&A for people who want to be financially literate
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Writers
Q&A for authors, editors, reviewers, professional writers, and aspiring writers
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites