Stack Overflow
Q&A for professional and enthusiast programmers
Travel
Q&A for road warriors and seasoned travelers
Super User
Q&A for computer enthusiasts and power users
SharePoint
Q&A for SharePoint enthusiasts
Psychology & Neuroscience
Q&A for practitioners, researchers, and students in cognitive science, psychology, neuroscience, and psychiatry
Ask Ubuntu
Q&A for Ubuntu users and developers
The Workplace
Q&A for members of the workforce navigating the professional setting
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Personal Finance & Money
Q&A for people who want to be financially literate
Biology
Q&A for biology researchers, academics, and students
Physics
Q&A for active researchers, academics and students of physics
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Engineering
Q&A for professionals and students of engineering
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Academia
Q&A for academics and those enrolled in higher education
Mathematics
Q&A for people studying math at any level and professionals in related fields
Computer Science Educators
Q&A for those involved in the field of teaching Computer Science