Mathematics
Q&A for people studying math at any level and professionals in related fields
Physics
Q&A for active researchers, academics and students of physics
Stack Overflow
Q&A for professional and enthusiast programmers
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Information Security
Q&A for information security professionals
Code Review
Q&A for peer programmer code reviews
History of Science and Mathematics
Q&A for people interested in the history and origins of science and mathematics
Computer Science
Q&A for students, researchers and practitioners of computer science
Writing
Q&A for the craft of professional writing, including fiction, non-fiction, technical, scholarly, and commercial writing
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
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
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Ask Different
Q&A for power users of Apple hardware and software
Politics
Q&A for people interested in governments, policies, and political processes
Computer Graphics
Q&A for computer graphics researchers and programmers
Signal Processing
Q&A for practitioners of the art and science of signal, image and video processing
Data Science
Q&A for Data science professionals, Machine Learning specialists, and those interested in learning more about the field
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
MathOverflow
Q&A for professional mathematicians
Software Recommendations
Q&A for people seeking specific software recommendations
Engineering
Q&A for professionals and students of engineering
Chemistry
Q&A for scientists, academics, teachers, and students in the field of chemistry
Super User
Q&A for computer enthusiasts and power users
Computational Science
Q&A for scientists using computers to solve scientific problems
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Biology
Q&A for biology researchers, academics, and students
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
The Workplace
Q&A for members of the workforce navigating the professional setting
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Puzzling
Q&A for those who create, solve, and study puzzles
elementary OS
Q&A for developers and users of elementary OS and applications
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