Game Development
Q&A for professional and independent game developers
Mathematics
Q&A for people studying math at any level and professionals in related fields
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Photography
Q&A for professional, enthusiast and amateur photographers
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Musical Practice & Performance
Q&A for musicians, students, and enthusiasts
Physics
Q&A for active researchers, academics and students of physics
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Server Fault
Q&A for professional system and network administrators
User Experience
Q&A for user experience researchers and experts
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Audio-Video Production
Q&A for engineers, producers, editors, and enthusiasts spanning the fields of audio, video, and media creation
Computer Science
Q&A for students, researchers and practitioners of computer science
Chemistry
Q&A for scientists, academics, teachers and students
Personal Finance & Money
Q&A for people who want to be financially literate
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
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
Mi Yodeya
Q&A for those who base their lives on Jewish law and tradition and anyone interested in learning more
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
German Language & Usage
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Academia
Q&A for academics and those enrolled in higher education
Salesforce
Q&A for Salesforce administrators, implementation experts, developers and anybody in-between
English Language Learners
Q&A for speakers of other languages learning English
Reverse Engineering
Q&A for researchers and developers who explore the principles of a system through analysis of its structure, function, and operation
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Answers OnStartups
Q&A for entrepreneurs looking to start or run a new business
Biology
Q&A for biology researchers, academics, and students
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
The Workplace
Q&A for members of the workforce navigating the professional setting
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
Christianity
Q&A for committed Christians, experts in Christianity and those interested in learning more