Stack Overflow
Q&A for professional and enthusiast programmers
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Academia
Q&A for academics and those enrolled in higher education
Super User
Q&A for computer enthusiasts and power users
Computational Science
Q&A for scientists using computers to solve scientific problems
Graphic Design
Q&A for Graphic Design professionals, students, and enthusiasts
Engineering
Q&A for professionals and students of engineering
Web Applications
Q&A for power users of web applications
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts