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Stack Overflow
Q&A for professional and enthusiast programmers
Chinese Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Chinese language
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Area 51
Q&A for proposing new sites in the Stack Exchange network
Sports
Q&A for participants in team and individual sport activities
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Physics
Q&A for active researchers, academics and students of physics
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Arduino
Q&A for developers of open-source hardware and software that is compatible with Arduino
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Academia
Q&A for academics and those enrolled in higher education
The Great Outdoors
Q&A for people who love being outdoors enjoying nature and wilderness, and learning about the required skills and equipment
Mathematics Educators
Q&A for those involved in the field of teaching mathematics
Genealogy & Family History
Q&A for expert genealogists and people interested in genealogy or family history
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
MathOverflow
Q&A for professional mathematicians
Server Fault
Q&A for system and network administrators
Christianity
Q&A for committed Christians, experts in Christianity and those interested in learning more
Music: Practice & Theory
Q&A for musicians, students, and enthusiasts
Photography
Q&A for professional, enthusiast and amateur photographers
Home Improvement
Q&A for contractors and serious DIYers
Writing
Q&A for the craft of professional writing, including fiction, non-fiction, technical, scholarly, and commercial writing
Super User
Q&A for computer enthusiasts and power users
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Ask Ubuntu
Q&A for Ubuntu users and developers
User Experience
Q&A for user experience researchers and experts
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems