Stack Overflow
Q&A for professional and enthusiast programmers
Mathematics
Q&A for people studying math at any level and professionals in related fields
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Politics
Q&A for people interested in governments, policies, and political processes
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Puzzling
Q&A for those who create, solve, and study puzzles
Programming Language Design and Implementation
Q&A for designers and implementers of computer programming languages
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Retrocomputing
Q&A for vintage-computer hobbyists interested in restoring, preserving, and using the classic computer and gaming systems of yesteryear
Super User
Q&A for computer enthusiasts and power users
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
English Language Learners
Q&A for speakers of other languages learning English
Music: Practice & Theory
Q&A for musicians, students, and enthusiasts
Mi Yodeya
Q&A for those who base their lives on Jewish law and tradition and anyone interested in learning more
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Area 51
Q&A for proposing new sites in the Stack Exchange network
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Law
Q&A for legal professionals, students, and others with experience or interest in law
Travel
Q&A for road warriors and seasoned travelers
Information Security
Q&A for information security professionals
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Personal Finance & Money
Q&A for people who want to be financially literate
Space Exploration
Q&A for spacecraft operators, scientists, engineers, and enthusiasts
The Workplace
Q&A for members of the workforce navigating the professional setting
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
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Biblical Hermeneutics
Q&A for professors, theologians, and those interested in exegetical analysis of biblical texts
Astronomy
Q&A for astronomers and astrophysicists
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
German Language
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Code Review
Q&A for peer programmer code reviews
Arqade
Q&A for passionate videogamers on all platforms
Constructed Languages
Q&A for designers and users of artificial or invented languages, consciously developed instead of having developed naturally
Computational Science
Q&A for scientists using computers to solve scientific problems
Economics
Q&A for those who study, teach, research and apply economics and econometrics
Open Source
Q&A for people organizing, marketing or licensing open source development projects
Latin Language
Q&A for linguists, teachers, and students wanting to discuss the finer points of the Latin language
Academia
Q&A for academics and those enrolled in higher education
Seasoned Advice
Q&A for professional and amateur chefs
Writing
Q&A for the craft of professional writing, including fiction, non-fiction, technical, scholarly, and commercial writing
Engineering
Q&A for professionals and students of engineering
Spanish Language
Q&A for linguists, teachers, students and Spanish language enthusiasts in general wanting to discuss the finer points of the language
Aviation
Q&A for aircraft pilots, mechanics, and enthusiasts
Philosophy
Q&A for those interested in the study of the fundamental nature of knowledge, reality, and existence
Ask Ubuntu
Q&A for Ubuntu users and developers
Computer Science
Q&A for students, researchers and practitioners of computer science
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Christianity
Q&A for committed Christians, experts in Christianity and those interested in learning more
Mathematics Educators
Q&A for those involved in the field of teaching mathematics