Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Stack Overflow
Q&A for professional and enthusiast programmers
Ask Ubuntu
Q&A for Ubuntu users and developers
Information Security
Q&A for information security professionals
Server Fault
Q&A for system and network administrators
Super User
Q&A for computer enthusiasts and power users
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Network Engineering
Q&A for network engineers
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Code Review
Q&A for peer programmer code reviews
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Computer Science
Q&A for students, researchers and practitioners of computer science
Puzzling
Q&A for those who create, solve, and study puzzles
Music: Practice & Theory
Q&A for musicians, students, and enthusiasts
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
English Language Learners
Q&A for speakers of other languages learning English
Movies & TV
Q&A for movie and TV enthusiasts
Reverse Engineering
Q&A for researchers and developers who explore the principles of a system through analysis of its structure, function, and operation
Politics
Q&A for people interested in governments, policies, and political processes
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Aviation
Q&A for aircraft pilots, mechanics, and enthusiasts
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
The Workplace
Q&A for members of the workforce navigating the professional setting
The Great Outdoors
Q&A for people who love being outdoors enjoying nature and wilderness, and learning about the required skills and equipment
DevOps
Q&A for software engineers working on automated testing, continuous delivery, service integration and monitoring, and building SDLC infrastructure
Retrocomputing
Q&A for vintage-computer hobbyists interested in restoring, preserving, and using the classic computer and gaming systems of yesteryear
Language Learning
Q&A for students, teachers, polyglots, and anyone interested in the techniques of second-language acquisition
Software Recommendations
Q&A for people seeking specific software recommendations
Mathematics
Q&A for people studying math at any level and professionals in related fields
Physics
Q&A for active researchers, academics and students of physics
Ask Different
Q&A for power users of Apple hardware and software
User Experience
Q&A for user experience researchers and experts
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Vi and Vim
Q&A for people using the vi and Vim families of text editors
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
French Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the French language
Open Source
Q&A for people organizing, marketing or licensing open source development projects
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Woodworking
Q&A for professional and amateur woodworkers
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Web Applications
Q&A for power users of web applications
Philosophy
Q&A for those interested in the study of the fundamental nature of knowledge, reality, and existence
Chemistry
Q&A for scientists, academics, teachers, and students in the field of chemistry
Seasoned Advice
Q&A for professional and amateur chefs
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
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites