Mathematics
Q&A for people studying math at any level and professionals in related fields
MathOverflow
Q&A for professional mathematicians
Stack Overflow
Q&A for professional and enthusiast programmers
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Computer Science
Q&A for students, researchers and practitioners of computer science
Ukrainian Language
Q&A for linguists, teachers and students of the Ukrainian language
Signal Processing
Q&A for practitioners of the art and science of signal, image and video processing
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Writing
Q&A for the craft of professional writing, including fiction, non-fiction, technical, scholarly, and commercial writing
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
Data Science
Q&A for Data science professionals, Machine Learning specialists, and those interested in learning more about the field
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Academia
Q&A for academics and those enrolled in higher education
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Physics
Q&A for active researchers, academics and students of physics
Area 51
Q&A for proposing new sites in the Stack Exchange network