Physics
Q&A for active researchers, academics and students of physics
Mathematics
Q&A for people studying math at any level and professionals in related fields
Law
Q&A for legal professionals, students, and others with experience or interest in law
English Language & Usage
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Music: Practice & Theory
Q&A for musicians, students, and enthusiasts
Academia
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Politics
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Science Fiction & Fantasy
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Aviation
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Puzzling
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Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Chemistry
Q&A for scientists, academics, teachers, and students in the field of chemistry
Space Exploration
Q&A for spacecraft operators, scientists, engineers, and enthusiasts
English Language Learners
Q&A for speakers of other languages learning English
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Earth Science
Q&A for those interested in the geology, meteorology, oceanography, and environmental sciences
Astronomy
Q&A for astronomers and astrophysicists
Home Improvement
Q&A for contractors and serious DIYers
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Bitcoin
Q&A for Bitcoin users, developers, and enthusiasts
Mathematics Educators
Q&A for those involved in the field of teaching mathematics
Engineering
Q&A for professionals and students of engineering
Ask Different
Q&A for power users of Apple hardware and software
Sports
Q&A for participants in team and individual sport activities
Personal Finance & Money
Q&A for people who want to be financially literate
Expatriates
Q&A for people living abroad on a long-term basis
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
Biology
Q&A for biology researchers, academics, and students
The Workplace
Q&A for members of the workforce navigating the professional setting
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Pets
Q&A for pet owners, caretakers, breeders, veterinarians, and trainers
Philosophy
Q&A for those interested in the study of the fundamental nature of knowledge, reality, and existence
Operations Research
Q&A for operations research and analytics professionals, educators, and students
Writing
Q&A for the craft of professional writing, including fiction, non-fiction, technical, scholarly, and commercial writing
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
Sustainable Living
Q&A for folks dedicated to a lifestyle that can be maintained indefinitely without depleting available resources
Quantum Computing
Q&A for engineers, scientists, programmers, and computing professionals interested in quantum computing
Matter Modeling
Q&A for materials modelers and data scientists
Japanese Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Japanese language
Arqade
Q&A for passionate videogamers on all platforms
Economics
Q&A for those who study, teach, research and apply economics and econometrics
Literature
Q&A for scholars and enthusiasts of literature
Stack Overflow
Q&A for professional and enthusiast programmers
Photography
Q&A for professional, enthusiast and amateur photographers
Retrocomputing
Q&A for vintage-computer hobbyists interested in restoring, preserving, and using the classic computer and gaming systems of yesteryear
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
The Great Outdoors
Q&A for people who love being outdoors enjoying nature and wilderness, and learning about the required skills and equipment
Computational Science
Q&A for scientists using computers to solve scientific problems
Computer Science
Q&A for students, researchers and practitioners of computer science
German Language
Q&A for speakers of German wanting to discuss the finer points of the language and translation
History of Science and Mathematics
Q&A for people interested in the history and origins of science and mathematics
User Experience
Q&A for user experience researchers and experts
French Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the French language
MathOverflow
Q&A for professional mathematicians
Gardening & Landscaping
Q&A for gardeners and landscapers
Music Fans
Q&A for music historians, critics, and fans
Medical Sciences
Q&A for professionals in medical and allied health fields, students of those professions, related academics, and others with a sound understanding of medicine and healthcare-related sciences
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization