Stack Overflow
Q&A for professional and enthusiast programmers
Magento
Q&A for users of the Magento e-Commerce platform
Super User
Q&A for computer enthusiasts and power users
Drupal Answers
Q&A for Drupal developers and administrators
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Video Production
Q&A for engineers, producers, editors and enthusiasts spanning the fields of video and media creation
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Information Security
Q&A for information security professionals
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
Ask Different
Q&A for power users of Apple hardware and software
Web Applications
Q&A for power users of web applications
Ask Ubuntu
Q&A for Ubuntu users and developers
Server Fault
Q&A for system and network administrators
Space Exploration
Q&A for spacecraft operators, scientists, engineers, and enthusiasts
Home Improvement
Q&A for contractors and serious DIYers