Stack Overflow
Q&A for professional and enthusiast programmers
Super User
Q&A for computer enthusiasts and power users
Server Fault
Q&A for system and network administrators
Language Learning
Q&A for students, teachers, polyglots, and anyone interested in the techniques of second-language acquisition
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Bitcoin
Q&A for Bitcoin users, developers, and enthusiasts
Computer Science
Q&A for students, researchers and practitioners of computer science
History of Science and Mathematics
Q&A for people interested in the history and origins of science and mathematics
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
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
DevOps
Q&A for software engineers working on automated testing, continuous delivery, service integration and monitoring, and building SDLC infrastructure