Mathematics
Q&A for people studying math at any level and professionals in related fields
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Stack Overflow
Q&A for professional and enthusiast programmers
Quantitative Finance
Q&A for finance professionals and academics
MathOverflow
Q&A for professional mathematicians
Data Science
Q&A for Data science professionals, Machine Learning specialists, and those interested in learning more about the field
Computer Science
Q&A for students, researchers and practitioners of computer science
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
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Economics
Q&A for those who study, teach, research and apply economics and econometrics
Mathematica
Q&A for users of Wolfram Mathematica
Philosophy
Q&A for those interested in the study of the fundamental nature of knowledge, reality, and existence
Law
Q&A for legal professionals, students, and others with experience or interest in law
Computational Science
Q&A for scientists using computers to solve scientific problems