Stack Overflow
Q&A for professional and enthusiast programmers
Spanish Language
Q&A for linguists, teachers, students and Spanish language enthusiasts in general wanting to discuss the finer points of the language
Academia
Q&A for academics and those enrolled in higher education
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Graphic Design
Q&A for Graphic Design professionals, students, and enthusiasts
Travel
Q&A for road warriors and seasoned travelers
Super User
Q&A for computer enthusiasts and power users
Software Recommendations
Q&A for people seeking specific software recommendations
Hardware Recommendations
Q&A for people seeking specific hardware recommendations
Blender
Q&A for people who use Blender to create 3D graphics, animations, or games
Physics
Q&A for active researchers, academics and students of physics
Arduino
Q&A for developers of open-source hardware and software that is compatible with Arduino
Personal Finance & Money
Q&A for people who want to be financially literate
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Writing
Q&A for the craft of professional writing, including fiction, non-fiction, technical, scholarly, and commercial writing
Sports
Q&A for participants in team and individual sport activities
Mathematics
Q&A for people studying math at any level and professionals in related fields
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Open Data
Q&A for developers and researchers interested in open data