Stack Overflow
Q&A for professional and enthusiast programmers
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Computer Science
Q&A for students, researchers and practitioners of computer science
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Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
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Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
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Bitcoin
Q&A for Bitcoin users, developers, and enthusiasts
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Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
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Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
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Mathematics
Q&A for people studying math at any level and professionals in related fields
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Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
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