Stack Overflow
Q&A for professional and enthusiast programmers
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Music: Practice & Theory
Q&A for musicians, students, and enthusiasts
Code Review
Q&A for peer programmer code reviews
Travel
Q&A for road warriors and seasoned travelers
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
Chinese Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Chinese language
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Computer Science
Q&A for students, researchers and practitioners of computer science
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
Computational Science
Q&A for scientists using computers to solve scientific problems
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
German Language
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Biblical Hermeneutics
Q&A for professors, theologians, and those interested in exegetical analysis of biblical texts
French Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the French language
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Mathematics
Q&A for people studying math at any level and professionals in related fields
Programming Language Design and Implementation
Q&A for designers and implementers of computer programming languages