Ruby, C, Realbasic (and 6502 asm for fun).
Server Fault
Q&A for professional system and network administrators
Photography
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User Experience
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Theoretical Computer Science
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Ask Different
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Electrical Engineering
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Drupal Answers
Q&A for Drupal developers and administrators
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Programmers
Q&A for professional programmers interested in conceptual questions about software development
Meta Stack Overflow
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Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
WordPress Answers
Q&A for WordPress developers and administrators
Homebrewing
Q&A for dedicated home brewers and serious enthusiasts
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Personal Productivity
Q&A for people wanting to improve their personal productivity
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites