Lifehacks
Q&A for people looking to bypass life's everyday problems with simple tricks
Stack Overflow
Q&A for professional and enthusiast programmers
Medical Sciences
Q&A for professionals in medical and allied health fields, students of those professions, related academics, and others with a sound understanding of medicine and healthcare-related sciences
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Area 51
Q&A for proposing new sites in the Stack Exchange network
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Code Review
Q&A for peer programmer code reviews
Law
Q&A for legal professionals, students, and others with experience or interest in law
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Bitcoin
Q&A for Bitcoin users, developers, and enthusiasts
Server Fault
Q&A for system and network administrators
SharePoint
Q&A for SharePoint enthusiasts
Information Security
Q&A for information security professionals
English Language Learners
Q&A for speakers of other languages learning English
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Travel
Q&A for road warriors and seasoned travelers
Academia
Q&A for academics and those enrolled in higher education
Chess
Q&A for serious players and enthusiasts of chess
Super User
Q&A for computer enthusiasts and power users
Christianity
Q&A for committed Christians, experts in Christianity and those interested in learning more
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
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
Mathematics
Q&A for people studying math at any level and professionals in related fields
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Physics
Q&A for active researchers, academics and students of physics
Aviation
Q&A for aircraft pilots, mechanics, and enthusiasts
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems