Super User
Q&A for computer enthusiasts and power users
Travel
Q&A for road warriors and seasoned travelers
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Stack Overflow
Q&A for professional and enthusiast programmers
Information Security
Q&A for information security professionals
Web Applications
Q&A for power users of web applications
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
Server Fault
Q&A for system and network administrators
Area 51
Q&A for proposing new sites in the Stack Exchange network
Skeptics
Q&A for scientific skepticism
Mathematics
Q&A for people studying math at any level and professionals in related fields
Arduino
Q&A for developers of open-source hardware and software that is compatible with Arduino
Japanese Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Japanese language
Stack Overflow em Português
Perguntas e respostas para programadores profissionais e entusiastas
Genealogy & Family History
Q&A for expert genealogists and people interested in genealogy or family history
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Arqade
Q&A for passionate videogamers on all platforms
Game Development
Q&A for professional and independent game developers
Network Engineering
Q&A for network engineers
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Ask Ubuntu
Q&A for Ubuntu users and developers
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts