Stack Overflow
Q&A for professional and enthusiast programmers
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Physics
Q&A for active researchers, academics and students of physics
Mathematics
Q&A for people studying math at any level and professionals in related fields
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Code Review
Q&A for peer programmer code reviews
Seasoned Advice
Q&A for professional and amateur chefs
Christianity
Q&A for committed Christians, experts in Christianity and those interested in learning more
The Workplace
Q&A for members of the workforce navigating the professional setting
Computer Science
Q&A for students, researchers and practitioners of computer science
Puzzling
Q&A for those who create, solve, and study puzzles
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites