Stack Overflow
Q&A for professional and enthusiast programmers
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Super User
Q&A for computer enthusiasts and power users
Gardening & Landscaping
Q&A for gardeners and landscapers
Arqade
Q&A for passionate videogamers on all platforms
Server Fault
Q&A for system and network administrators
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Music: Practice & Theory
Q&A for musicians, students, and enthusiasts
Home Improvement
Q&A for contractors and serious DIYers
Information Security
Q&A for information security professionals
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Politics
Q&A for people interested in governments, policies, and political processes
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Web Applications
Q&A for power users of web applications
Hardware Recommendations
Q&A for people seeking specific hardware recommendations
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles