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
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Mathematics
Q&A for people studying math at any level and professionals in related fields
Biology
Q&A for biology researchers, academics, and students
Mathematics Educators
Q&A for those involved in the field of teaching mathematics
Bricks
Q&A for LEGO® and building block enthusiasts
Music: Practice & Theory
Q&A for musicians, students, and enthusiasts
Software Quality Assurance & Testing
Q&A for software quality control experts, automation engineers, and software testers
Chemistry
Q&A for scientists, academics, teachers, and students in the field of chemistry
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Quantitative Finance
Q&A for finance professionals and academics
The Workplace
Q&A for members of the workforce navigating the professional setting
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Data Science
Q&A for Data science professionals, Machine Learning specialists, and those interested in learning more about the field
Computational Science
Q&A for scientists using computers to solve scientific problems