Personal Productivity
Q&A for people wanting to improve their personal productivity
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
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
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
User Experience
Q&A for user experience researchers and experts
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
The Workplace
Q&A for members of the workforce navigating the professional setting
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