Puzzling
Q&A for those who create, solve, and study puzzles
Mathematics
Q&A for people studying math at any level and professionals in related fields
Stack Overflow
Q&A for professional and enthusiast programmers
Information Security
Q&A for information security professionals
Tor
Q&A for researchers, developers, and users of Tor
Super User
Q&A for computer enthusiasts and power users
Chemistry
Q&A for scientists, academics, teachers, and students in the field of chemistry
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
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
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Physics
Q&A for active researchers, academics and students of physics
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system