Mathematics
Q&A for people studying math at any level and professionals in related fields
Stack Overflow
Q&A for professional and enthusiast programmers
Mathematica
Q&A for users of Wolfram Mathematica
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Ask Different
Q&A for power users of Apple hardware and software
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
Physics
Q&A for active researchers, academics and students of physics
Vi and Vim
Q&A for people using the vi and Vim families of text editors
Biology
Q&A for biology researchers, academics, and students
French Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the French language
Data Science
Q&A for Data science professionals, Machine Learning specialists, and those interested in learning more about the field
Chemistry
Q&A for scientists, academics, teachers, and students in the field of chemistry
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Writing
Q&A for the craft of professional writing, including fiction, non-fiction, technical, scholarly, and commercial writing
Computer Science
Q&A for students, researchers and practitioners of computer science
Super User
Q&A for computer enthusiasts and power users
Emacs
Q&A for those using, extending or developing Emacs
Poker
Q&A for serious players and enthusiasts of poker
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Academia
Q&A for academics and those enrolled in higher education