Mathematics
Q&A for people studying math at any level and professionals in related fields
History of Science and Mathematics
Q&A for people interested in the history and origins of science and mathematics
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
MathOverflow
Q&A for professional mathematicians
Academia
Q&A for academics and those enrolled in higher education
Super User
Q&A for computer enthusiasts and power users
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
English Language Learners
Q&A for speakers of other languages learning English
French Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the French language
Stack Overflow
Q&A for professional and enthusiast programmers
Computer Science
Q&A for students, researchers and practitioners of computer science
Philosophy
Q&A for those interested in the study of the fundamental nature of knowledge, reality, and existence
Aviation
Q&A for aircraft pilots, mechanics, and enthusiasts
Web Applications
Q&A for power users of web applications
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
German Language
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Personal Finance & Money
Q&A for people who want to be financially literate
Artificial Intelligence
Q&A for people interested in conceptual questions about life and challenges in a world where "cognitive" functions can be mimicked in purely digital environment