Astronomy
Q&A for astronomers and astrophysicists
Sustainable Living
Q&A for folks dedicated to a lifestyle that can be maintained indefinitely without depleting available resources
Graphic Design
Q&A for Graphic Design professionals, students, and enthusiasts
Super User
Q&A for computer enthusiasts and power users
Space Exploration
Q&A for spacecraft operators, scientists, engineers, and enthusiasts
Earth Science
Q&A for those interested in the geology, meteorology, oceanography, and environmental sciences
Home Improvement
Q&A for contractors and serious DIYers
Buddhism
Q&A for people practicing or interested in Buddhist philosophy, teaching, and practice
Ask Different
Q&A for power users of Apple hardware and software
Stack Overflow
Q&A for professional and enthusiast programmers
Emacs
Q&A for those using, extending or developing Emacs
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Academia
Q&A for academics and those enrolled in higher education
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Biology
Q&A for biology researchers, academics, and students
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Physics
Q&A for active researchers, academics and students of physics