Stack Overflow
Q&A for professional and enthusiast programmers
Super User
Q&A for computer enthusiasts and power users
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Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
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Academia
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Signal Processing
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Vi and Vim
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Music: Practice & Theory
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Pets
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Area 51
Q&A for proposing new sites in the Stack Exchange network
Travel
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Meta Stack Exchange
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Software Engineering
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Mathematics
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Parenting
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Web Applications
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User Experience
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Arqade
Q&A for passionate videogamers on all platforms
Database Administrators
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Personal Finance & Money
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Gardening & Landscaping
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Android Enthusiasts
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Graphic Design
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The Great Outdoors
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Software Recommendations
Q&A for people seeking specific software recommendations
Movies & TV
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Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Lifehacks
Q&A for people looking to bypass life's everyday problems with simple tricks
Politics
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Biology
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History
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Worldbuilding
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Bicycles
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The Workplace
Q&A for members of the workforce navigating the professional setting
Ask Ubuntu
Q&A for Ubuntu users and developers
Physics
Q&A for active researchers, academics and students of physics
German Language
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Server Fault
Q&A for system and network administrators
Skeptics
Q&A for scientific skepticism
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Interpersonal Skills
Q&A for people looking to improve their interpersonal communication skills