Mathematics
Q&A for people studying math at any level and professionals in related fields
Stack Overflow
Q&A for professional and enthusiast programmers
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Computer Science
Q&A for students, researchers and practitioners of computer science
Super User
Q&A for computer enthusiasts and power users
MathOverflow
Q&A for professional mathematicians
Personal Finance & Money
Q&A for people who want to be financially literate
Signal Processing
Q&A for practitioners of the art and science of signal, image and video processing
Engineering
Q&A for professionals and students of engineering
Academia
Q&A for academics and those enrolled in higher education
Software Recommendations
Q&A for people seeking specific software recommendations
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Lifehacks
Q&A for people looking to bypass life's everyday problems with simple tricks
Computational Science
Q&A for scientists using computers to solve scientific problems
Data Science
Q&A for Data science professionals, Machine Learning specialists, and those interested in learning more about the field
Code Review
Q&A for peer programmer code reviews
Home Improvement
Q&A for contractors and serious DIYers
Computer Graphics
Q&A for computer graphics researchers and programmers
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Puzzling
Q&A for those who create, solve, and study puzzles
The Workplace
Q&A for members of the workforce navigating the professional setting
Artificial Intelligence
Q&A for people interested in conceptual questions about life and challenges in a world where "cognitive" functions can be mimicked in purely digital environment
Open Source
Q&A for people organizing, marketing or licensing open source development projects
English Language Learners
Q&A for speakers of other languages learning English
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Arduino
Q&A for developers of open-source hardware and software that is compatible with Arduino
Drupal Answers
Q&A for Drupal developers and administrators
WordPress Development
Q&A for WordPress developers and administrators
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Physics
Q&A for active researchers, academics and students of physics
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Server Fault
Q&A for system and network administrators
Web Applications
Q&A for power users of web applications
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Ask Different
Q&A for power users of Apple hardware and software
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
User Experience
Q&A for user experience researchers and experts
Information Security
Q&A for information security professionals
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Chemistry
Q&A for scientists, academics, teachers, and students in the field of chemistry
Mathematica
Q&A for users of Wolfram Mathematica
Robotics
Q&A for professional robotic engineers, hobbyists, researchers and students
elementary OS
Q&A for developers and users of elementary OS and applications
Hardware Recommendations
Q&A for people seeking specific hardware recommendations