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Stack Overflow
Q&A for professional and enthusiast programmers
Server Fault
Q&A for professional system and network administrators
Programmers
Q&A for professional programmers interested in conceptual questions about software development
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.
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Physics
Q&A for active researchers, academics and students of physics
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Game Development
Q&A for professional and independent game developers
The Workplace
Q&A for members of the workforce navigating the professional setting
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Home Improvement
Q&A for contractors and serious DIYers
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
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
User Experience
Q&A for user experience researchers and experts
Mathematics
Q&A for people studying math at any level and professionals in related fields
WordPress Answers
Q&A for WordPress developers and administrators
Ask Patents
Q&A for people interested in improving and participating in the patent system
Graphic Design
Q&A for professional graphic designers and non-designers trying to do their own graphic design
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Photography
Q&A for professional, enthusiast and amateur photographers