Stack Overflow
Q&A for professional and enthusiast programmers
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Super User
Q&A for computer enthusiasts and power users
Ask Ubuntu
Q&A for Ubuntu users and developers
Area 51
Q&A for proposing new sites in the Stack Exchange network
Gardening & Landscaping
Q&A for gardeners and landscapers
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Open Source
Q&A for people organizing, marketing or licensing open source development projects
Seasoned Advice
Q&A for professional and amateur chefs
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Music: Practice & Theory
Q&A for musicians, students, and enthusiasts
Pets
Q&A for pet owners, caretakers, breeders, veterinarians, and trainers
Personal Finance & Money
Q&A for people who want to be financially literate
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Biology
Q&A for biology researchers, academics, and students
Computer Science
Q&A for students, researchers and practitioners of computer science
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Web Applications
Q&A for power users of web applications
Economics
Q&A for those who study, teach, research and apply economics and econometrics
Vi and Vim
Q&A for people using the vi and Vim families of text editors
Code Review
Q&A for peer programmer code reviews
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
The Workplace
Q&A for members of the workforce navigating the professional setting
Academia
Q&A for academics and those enrolled in higher education
User Experience
Q&A for user experience researchers and experts
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
Mathematica
Q&A for users of Wolfram Mathematica
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Server Fault
Q&A for system and network administrators
Mathematics
Q&A for people studying math at any level and professionals in related fields
Information Security
Q&A for information security professionals
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Ask Different
Q&A for power users of Apple hardware and software
Data Science
Q&A for Data science professionals, Machine Learning specialists, and those interested in learning more about the field
Open Data
Q&A for developers and researchers interested in open data