Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Stack Overflow
Q&A for professional and enthusiast programmers
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Answers OnStartups
Q&A for entrepreneurs looking to start or run a new business
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Game Development
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Role-playing Games
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Physics
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User Experience
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Mathematics
Q&A for people studying math at any level and professionals in related fields
Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Server Fault
Q&A for professional system and network administrators
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Quantitative Finance
Q&A for finance professionals and academics
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role