Stack Overflow
Q&A for professional and enthusiast programmers
Home Improvement
Q&A for contractors and serious DIYers
Arduino
Q&A for developers of open-source hardware and software that is compatible with Arduino
Ask Ubuntu
Q&A for Ubuntu users and developers
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Physics
Q&A for active researchers, academics and students of physics
Server Fault
Q&A for system and network administrators
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
Personal Finance & Money
Q&A for people who want to be financially literate
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Bitcoin
Q&A for Bitcoin users, developers, and enthusiasts
Information Security
Q&A for information security professionals
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Mathematics
Q&A for people studying math at any level and professionals in related fields
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Academia
Q&A for academics and those enrolled in higher education
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Super User
Q&A for computer enthusiasts and power users
Code Review
Q&A for peer programmer code reviews
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Network Engineering
Q&A for network engineers
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles