Super User
Q&A for computer enthusiasts and power users
Stack Overflow
Q&A for professional and enthusiast programmers
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Web Applications
Q&A for power users of web applications
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
Server Fault
Q&A for system and network administrators
Spanish Language
Q&A for linguists, teachers, students and Spanish language enthusiasts in general wanting to discuss the finer points of the language
Arduino
Q&A for developers of open-source hardware and software that is compatible with Arduino
Stack Overflow en español
Preguntas y respuestas para programadores y profesionales de la informática
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
German Language
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Video Production
Q&A for engineers, producers, editors and enthusiasts spanning the fields of video and media creation
Ethereum
Q&A for users of Ethereum, the decentralized application platform and smart contract enabled blockchain
Bitcoin
Q&A for Bitcoin users, developers, and enthusiasts