Stack Overflow
Q&A for professional and enthusiast programmers
Software Quality Assurance & Testing
Q&A for software quality control experts, automation engineers, and software testers
Super User
Q&A for computer enthusiasts and power users
Server Fault
Q&A for system and network administrators
Skeptics
Q&A for scientific skepticism
SharePoint
Q&A for SharePoint enthusiasts
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Ask Ubuntu
Q&A for Ubuntu users and developers
Information Security
Q&A for information security professionals
Arqade
Q&A for passionate videogamers on all platforms
Ask Different
Q&A for power users of Apple hardware and software
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Web Applications
Q&A for power users of web applications
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
DevOps
Q&A for software engineers working on automated testing, continuous delivery, service integration and monitoring, and building SDLC infrastructure