TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Mathematica
Q&A for users of Wolfram Mathematica
Server Fault
Q&A for system and network administrators
Super User
Q&A for computer enthusiasts and power users
Photography
Q&A for professional, enthusiast and amateur photographers
Software Recommendations
Q&A for people seeking specific software recommendations
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Stack Overflow
Q&A for professional and enthusiast programmers
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
Ask Ubuntu
Q&A for Ubuntu users and developers
Law
Q&A for legal professionals, students, and others with experience or interest in law
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Web Applications
Q&A for power users of web applications