Stack Overflow
Q&A for professional and enthusiast programmers
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Super User
Q&A for computer enthusiasts and power users
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Lifehacks
Q&A for people looking to bypass life's everyday problems with simple tricks
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
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
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Robotics
Q&A for professional robotic engineers, hobbyists, researchers and students
Web Applications
Q&A for power users of web applications
Ask Different
Q&A for power users of Apple hardware and software