Stack Overflow
Q&A for professional and enthusiast programmers
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Woodworking
Q&A for professional and amateur woodworkers
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Physics
Q&A for active researchers, academics and students of physics
Home Improvement
Q&A for contractors and serious DIYers
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
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Engineering
Q&A for professionals and students of engineering
Magento
Q&A for users of the Magento e-Commerce platform
Ethereum
Q&A for users of Ethereum, the decentralized application platform and smart contract enabled blockchain
SharePoint
Q&A for SharePoint enthusiasts
Mathematics
Q&A for people studying math at any level and professionals in related fields
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Lifehacks
Q&A for people looking to bypass life's everyday problems with simple tricks
Sustainable Living
Q&A for folks dedicated to a lifestyle that can be maintained indefinitely without depleting available resources
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
Software Quality Assurance & Testing
Q&A for software quality control experts, automation engineers, and software testers
Arduino
Q&A for developers of open-source hardware and software that is compatible with Arduino
Area 51
Q&A for proposing new sites in the Stack Exchange network