Stack Overflow
Q&A for professional and enthusiast programmers
Academia
Q&A for academics and those enrolled in higher education
Personal Finance & Money
Q&A for people who want to be financially literate
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Audio-Video Production
Q&A for engineers, producers, editors, and enthusiasts spanning the fields of audio, video, and media creation
Ask Patents
Q&A for people interested in improving and participating in the patent system
Answers OnStartups
Q&A for entrepreneurs looking to start or run a new business
Mathematics
Q&A for people studying math at any level and professionals in related fields
Web Applications
Q&A for power users of web applications
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Server Fault
Q&A for professional system and network administrators
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites