Stack Overflow
Q&A for professional and enthusiast programmers
Mathematics
Q&A for people studying math at any level and professionals in related fields
Ask Ubuntu
Q&A for Ubuntu users and developers
Graphic Design
Q&A for Graphic Design professionals, students, and enthusiasts
Game Development
Q&A for professional and independent game developers
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Blender
Q&A for people who use Blender to create 3D graphics, animations, or games
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Retrocomputing
Q&A for vintage-computer hobbyists interested in restoring, preserving, and using the classic computer and gaming systems of yesteryear
Computer Science
Q&A for students, researchers and practitioners of computer science
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Super User
Q&A for computer enthusiasts and power users
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Proof Assistants
Q&A for mathematicians and computer scientists who develop and use proof assistants