Super User
Q&A for computer enthusiasts and power users
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Ask Ubuntu
Q&A for Ubuntu users and developers
Stack Overflow
Q&A for professional and enthusiast programmers
Server Fault
Q&A for system and network administrators
Physics
Q&A for active researchers, academics and students of physics
WordPress Development
Q&A for WordPress developers and administrators
Vi and Vim
Q&A for people using the vi and Vim families of text editors
Video Production
Q&A for engineers, producers, editors and enthusiasts spanning the fields of video and media creation
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Web Applications
Q&A for power users of web applications
Computer Science
Q&A for students, researchers and practitioners of computer science
Photography
Q&A for professional, enthusiast and amateur photographers
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Drupal Answers
Q&A for Drupal developers and administrators
Graphic Design
Q&A for Graphic Design professionals, students, and enthusiasts