Academia
Q&A for academics and those enrolled in higher education
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Astronomy
Q&A for astronomers and astrophysicists
Stack Overflow
Q&A for professional and enthusiast programmers
Travel
Q&A for road warriors and seasoned travelers
Space Exploration
Q&A for spacecraft operators, scientists, engineers, and enthusiasts
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
The Workplace
Q&A for members of the workforce navigating the professional setting
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Earth Science
Q&A for those interested in the geology, meteorology, oceanography, and environmental sciences
Personal Finance & Money
Q&A for people who want to be financially literate
Physics
Q&A for active researchers, academics and students of physics
Information Security
Q&A for information security professionals
Home Improvement
Q&A for contractors and serious DIYers
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Seasoned Advice
Q&A for professional and amateur chefs
Code Review
Q&A for peer programmer code reviews
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Open Source
Q&A for people organizing, marketing or licensing open source development projects
Mathematics Educators
Q&A for those involved in the field of teaching mathematics
Computational Science
Q&A for scientists using computers to solve scientific problems
Law
Q&A for legal professionals, students, and others with experience or interest in law
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
User Experience
Q&A for user experience researchers and experts
Ask Ubuntu
Q&A for Ubuntu users and developers
Politics
Q&A for people interested in governments, policies, and political processes
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
English Language Learners
Q&A for speakers of other languages learning English