Stack Overflow
Q&A for professional and enthusiast programmers
Ask Different
Q&A for power users of Apple hardware and software
Super User
Q&A for computer enthusiasts and power users
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
Mathematics
Q&A for people studying math at any level and professionals in related fields
Stack Overflow на русском
Вопросы и ответы для программистов
Information Security
Q&A for information security professionals
Server Fault
Q&A for system and network administrators
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Computer Graphics
Q&A for computer graphics researchers and programmers
Movies & TV
Q&A for movie and TV enthusiasts
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Game Development
Q&A for professional and independent game developers
Network Engineering
Q&A for network engineers
Code Review
Q&A for peer programmer code reviews
Arqade
Q&A for passionate videogamers on all platforms
Vi and Vim
Q&A for people using the vi and Vim families of text editors
DevOps
Q&A for software engineers working on automated testing, continuous delivery, service integration and monitoring, and building SDLC infrastructure