Stack Overflow
Q&A for professional and enthusiast programmers
Super User
Q&A for computer enthusiasts and power users
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Internet of Things
Q&A for builders and users of networked sensors and control devices in the contexts of smart homes, industry automation, or environmental sensors
Web Applications
Q&A for power users of web applications
Ask Different
Q&A for power users of Apple hardware and software
Physics
Q&A for active researchers, academics and students of physics
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Graphic Design
Q&A for Graphic Design professionals, students, and enthusiasts
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Engineering
Q&A for professionals and students of engineering
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Arduino
Q&A for developers of open-source hardware and software that is compatible with Arduino
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems