Stack Overflow
Q&A for professional and enthusiast programmers
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Vi and Vim
Q&A for people using the vi and Vim families of text editors
Ask Different
Q&A for power users of Apple hardware and software
Super User
Q&A for computer enthusiasts and power users
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Area 51
Q&A for proposing new sites in the Stack Exchange network
Information Security
Q&A for information security professionals
Server Fault
Q&A for system and network administrators
Puzzling
Q&A for those who create, solve, and study puzzles
Emacs
Q&A for those using, extending or developing Emacs
Arqade
Q&A for passionate videogamers on all platforms
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Code Review
Q&A for peer programmer code reviews
Philosophy
Q&A for those interested in the study of the fundamental nature of knowledge, reality, and existence
Game Development
Q&A for professional and independent game developers
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Home Improvement
Q&A for contractors and serious DIYers
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Computer Science
Q&A for students, researchers and practitioners of computer science
Chinese Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Chinese language
English Language Learners
Q&A for speakers of other languages learning English
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Mathematics
Q&A for people studying math at any level and professionals in related fields
elementary OS
Q&A for developers and users of elementary OS and applications