Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
Ask Different
Q&A for power users of Apple hardware and software
Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
Photography
Q&A for professional, enthusiast and amateur photographers
Mathematics
Q&A for people studying math at any level and professionals in related fields
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Server Fault
Q&A for professional system and network administrators
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Open Data
Q&A for developers and researchers interested in open data
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
Quantitative Finance
Q&A for finance professionals and academics