Stack Overflow
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Physics
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Arqade
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Mathematics
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Theoretical Computer Science
Q&A for theoretical computer scientists and researchers 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
Server Fault
Q&A for professional system and network administrators
Ask Different
Q&A for power users of Apple hardware and software
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
French Language & Usage
Q&A for students, teachers, and linguists wanting to discuss the finer points of the French language
