Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Academia
Q&A for academics and those enrolled in higher education
Philosophy
Q&A for those interested in the study of the fundamental nature of knowledge, reality, and existence
Earth Science
Q&A for those interested in the geology, meteorology, oceanography, and environmental sciences
Computer Science Educators
Q&A for those involved in the field of teaching Computer Science
Data Science
Q&A for Data science professionals, Machine Learning specialists, and those interested in learning more about the field
Mathematics Educators
Q&A for those involved in the field of teaching mathematics
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
Astronomy
Q&A for astronomers and astrophysicists
Chess
Q&A for serious players and enthusiasts of chess
Music: Practice & Theory
Q&A for musicians, students, and enthusiasts
Area 51
Q&A for proposing new sites in the Stack Exchange network
Stack Overflow
Q&A for professional and enthusiast programmers
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
Law
Q&A for legal professionals, students, and others with experience or interest in law
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Retrocomputing
Q&A for vintage-computer hobbyists interested in restoring, preserving, and using the classic computer and gaming systems of yesteryear
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
MathOverflow
Q&A for professional mathematicians
Open Source
Q&A for people organizing, marketing or licensing open source development projects
Politics
Q&A for people interested in governments, policies, and political processes
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Medical Sciences
Q&A for professionals in medical and allied health fields, students of those professions, related academics, and others with a sound understanding of medicine and healthcare-related sciences