Mathematics
Q&A for people studying math at any level and professionals in related fields
Stack Overflow
Q&A for professional and enthusiast programmers
Operations Research
Q&A for operations research and analytics professionals, educators, and students
Puzzling
Q&A for those who create, solve, and study puzzles
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Computer Science
Q&A for students, researchers and practitioners of computer science
Vi and Vim
Q&A for people using the vi and Vim families of text editors
Psychology & Neuroscience
Q&A for practitioners, researchers, and students in cognitive science, psychology, neuroscience, and psychiatry
Information Security
Q&A for information security professionals
Software Recommendations
Q&A for people seeking specific software recommendations
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Super User
Q&A for computer enthusiasts and power users
Physics
Q&A for active researchers, academics and students of physics
Philosophy
Q&A for those interested in the study of the fundamental nature of knowledge, reality, and existence