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.
Mathematics
Q&A for people studying math at any level and professionals in related fields
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Reverse Engineering
Q&A for researchers and developers who explore the principles of a system through analysis of its structure, function, and operation
Quantitative Finance
Q&A for finance professionals and academics
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Russian Language & Usage
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Russian language
