TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Mathematics
Q&A for people studying math at any level and professionals in related fields
Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Server Fault
Q&A for professional system and network administrators
Physics
Q&A for active researchers, academics and students of physics
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Game Development
Q&A for professional and independent game developers
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers