Mathematics
Q&A for people studying math at any level and professionals in related fields
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Puzzling
Q&A for those who create, solve, and study puzzles
Lifehacks
Q&A for people looking to bypass life's everyday problems with simple tricks
Space Exploration
Q&A for spacecraft operators, scientists, engineers, and enthusiasts
Physics
Q&A for active researchers, academics and students of physics
Ask Ubuntu
Q&A for Ubuntu users and developers
Graphic Design
Q&A for Graphic Design professionals, students, and enthusiasts
Chemistry
Q&A for scientists, academics, teachers, and students in the field of chemistry
Seasoned Advice
Q&A for professional and amateur chefs
Biology
Q&A for biology researchers, academics, and students
Home Improvement
Q&A for contractors and serious DIYers
Super User
Q&A for computer enthusiasts and power users
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Stack Overflow
Q&A for professional and enthusiast programmers
Mathematica
Q&A for users of Wolfram Mathematica
Chinese Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Chinese language
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
The Workplace
Q&A for members of the workforce navigating the professional setting
Chess
Q&A for serious players and enthusiasts of chess
Ethereum
Q&A for users of Ethereum, the decentralized application platform and smart contract enabled blockchain