Mathematics
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TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Stack Overflow
Q&A for professional and enthusiast programmers
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Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Mi Yodeya
Q&A for those who base their lives on Jewish law and tradition and anyone interested in learning more
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
Ask Different
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Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
WordPress Answers
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Stack Apps
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Server Fault
Q&A for professional system and network administrators
Theoretical Computer Science
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Game Development
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Programmers
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User Experience
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Personal Productivity
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Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Musical Practice & Performance
Q&A for musicians, students, and enthusiasts
