Mathematics
Q&A for people studying math at any level and professionals in related fields
French Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the French language
Stack Overflow
Q&A for professional and enthusiast programmers
Physics
Q&A for active researchers, academics and students of physics
Software Recommendations
Q&A for people seeking specific software recommendations
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Engineering
Q&A for professionals and students of engineering
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Woodworking
Q&A for professional and amateur woodworkers
Chemistry
Q&A for scientists, academics, teachers, and students in the field of chemistry