Mathematica
Q&A for users of Wolfram Mathematica
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Information Security
Q&A for information security professionals
Emacs
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Astronomy
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Mathematics
Q&A for people studying math at any level and professionals in related fields
Stack Overflow
Q&A for professional and enthusiast programmers
Ask Different
Q&A for power users of Apple hardware and software
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Graphic Design
Q&A for Graphic Design professionals, students, and enthusiasts
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Web Applications
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Open Source
Q&A for people organizing, marketing or licensing open source development projects
Bitcoin
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Biology
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MathOverflow
Q&A for professional mathematicians
WordPress Development
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Software Recommendations
Q&A for people seeking specific software recommendations
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Data Science
Q&A for Data science professionals, Machine Learning specialists, and those interested in learning more about the field
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
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Video Production
Q&A for engineers, producers, editors and enthusiasts spanning the fields of video and media creation
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
English Language Learners
Q&A for speakers of other languages learning English
Academia
Q&A for academics and those enrolled in higher education
Server Fault
Q&A for system and network administrators
Puzzling
Q&A for those who create, solve, and study puzzles
Computational Science
Q&A for scientists using computers to solve scientific problems
Physics
Q&A for active researchers, academics and students of physics
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
elementary OS
Q&A for developers and users of elementary OS and applications