Stack Overflow
Q&A for professional and enthusiast programmers
Server Fault
Q&A for system and network administrators
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
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
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Physics
Q&A for active researchers, academics and students of physics
Code Review
Q&A for peer programmer code reviews
Retrocomputing
Q&A for vintage-computer hobbyists interested in restoring, preserving, and using the classic computer and gaming systems of yesteryear
Vi and Vim
Q&A for people using the vi and Vim families of text editors