Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
User Experience
Q&A for user experience researchers and experts
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
WordPress Answers
Q&A for WordPress developers and administrators
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Server Fault
Q&A for professional system and network administrators
Mi Yodeya
Q&A for those who base their lives on Jewish law and tradition and anyone interested in learning more
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Photography
Q&A for professional, enthusiast and amateur photographers
Mathematics
Q&A for people studying math at any level and professionals in related fields
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Personal Finance & Money
Q&A for people who want to be financially literate
Sports
Q&A for participants in team and individual sport activities
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Answers OnStartups
Q&A for entrepreneurs looking to start or run a new business
Quantitative Finance
Q&A for finance professionals and academics
Personal Productivity
Q&A for people wanting to improve their personal productivity
Ask Different
Q&A for power users of Apple hardware and software
Graphic Design
Q&A for professional graphic designers and non-designers trying to do their own graphic design