Web Applications
Q&A for power users of web applications
Stack Overflow
Q&A for professional and enthusiast programmers
Super User
Q&A for computer enthusiasts and power users
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Ask Different
Q&A for power users of Apple hardware and software
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Photography
Q&A for professional, enthusiast and amateur photographers
Arqade
Q&A for passionate videogamers on all platforms
Academia
Q&A for academics and those enrolled in higher education
Physics
Q&A for active researchers, academics and students of physics
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Personal Finance & Money
Q&A for people who want to be financially literate
Server Fault
Q&A for system and network administrators
The Workplace
Q&A for members of the workforce navigating the professional setting
Philosophy
Q&A for those interested in the study of the fundamental nature of knowledge, reality, and existence