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
Biology
Q&A for biology researchers, academics, and students
Spanish Language & Usage
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Spanish language
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
Game Development
Q&A for professional and independent game developers
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Signal Processing
Q&A for practitioners of the art and science of signal, image and video processing
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Computer Science
Q&A for students, researchers and practitioners of computer science
