Stack Overflow
Q&A for professional and enthusiast programmers
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Data Science
Q&A for Data science professionals, Machine Learning specialists, and those interested in learning more about the field
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Biology
Q&A for biology researchers, academics, and students
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Bioinformatics
Q&A for researchers, developers, students, teachers, and end users interested in bioinformatics
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Super User
Q&A for computer enthusiasts and power users
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