Puzzling
Q&A for those who create, solve, and study puzzles
Computer Science Educators
Q&A for those involved in the field of teaching Computer Science
Server Fault
Q&A for system and network administrators
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Stack Overflow
Q&A for professional and enthusiast programmers
Physics
Q&A for active researchers, academics and students of physics
Chess
Q&A for serious players and enthusiasts of chess
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
English Language Learners
Q&A for speakers of other languages learning English
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Travel
Q&A for road warriors and seasoned travelers
Astronomy
Q&A for astronomers and astrophysicists
Academia
Q&A for academics and those enrolled in higher education
User Experience
Q&A for user experience researchers and experts
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Music: Practice & Theory
Q&A for musicians, students, and enthusiasts
Mathematics
Q&A for people studying math at any level and professionals in related fields
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
The Great Outdoors
Q&A for people who love being outdoors enjoying nature and wilderness, and learning about the required skills and equipment
Gardening & Landscaping
Q&A for gardeners and landscapers
Information Security
Q&A for information security professionals
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Ask Ubuntu
Q&A for Ubuntu users and developers
The Workplace
Q&A for members of the workforce navigating the professional setting
Space Exploration
Q&A for spacecraft operators, scientists, engineers, and enthusiasts
Ask Different
Q&A for power users of Apple hardware and software
Super User
Q&A for computer enthusiasts and power users
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle