Super User
Q&A for computer enthusiasts and power users
Arqade
Q&A for passionate videogamers on all platforms
Software Recommendations
Q&A for people seeking specific software recommendations
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
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
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Area 51
Q&A for proposing new sites in the Stack Exchange network
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Photography
Q&A for professional, enthusiast and amateur photographers
Server Fault
Q&A for system and network administrators
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Stack Overflow
Q&A for professional and enthusiast programmers
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Home Improvement
Q&A for contractors and serious DIYers
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Information Security
Q&A for information security professionals
The Workplace
Q&A for members of the workforce navigating the professional setting
Earth Science
Q&A for those interested in the geology, meteorology, oceanography, and environmental sciences
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Biology
Q&A for biology researchers, academics, and students
Bricks
Q&A for LEGO® and building block enthusiasts
Community Building
Q&A for community managers, administrators, and moderators