Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Stack Overflow
Q&A for professional and enthusiast programmers
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Arduino
Q&A for developers of open-source hardware and software that is compatible with Arduino
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Super User
Q&A for computer enthusiasts and power users
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Movies & TV
Q&A for movie and TV enthusiasts
Information Security
Q&A for information security professionals
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Server Fault
Q&A for system and network administrators
Engineering
Q&A for professionals and students of engineering
Home Improvement
Q&A for contractors and serious DIYers
Physics
Q&A for active researchers, academics and students of physics