Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Stack Overflow
Q&A for professional and enthusiast programmers
Signal Processing
Q&A for practitioners of the art and science of signal, image and video processing
Artificial Intelligence
Q&A for people interested in conceptual questions about life and challenges in a world where "cognitive" functions can be mimicked in purely digital environment
Seasoned Advice
Q&A for professional and amateur chefs
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Data Science
Q&A for Data science professionals, Machine Learning specialists, and those interested in learning more about the field
Super User
Q&A for computer enthusiasts and power users
Area 51
Q&A for proposing new sites in the Stack Exchange network
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Physics
Q&A for active researchers, academics and students of physics
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
WordPress Development
Q&A for WordPress developers and administrators
Robotics
Q&A for professional robotic engineers, hobbyists, researchers and students
Mathematics
Q&A for people studying math at any level and professionals in related fields
Game Development
Q&A for professional and independent game developers
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Blender
Q&A for people who use Blender to create 3D graphics, animations, or games
Engineering
Q&A for professionals and students of engineering
Computer Science
Q&A for students, researchers and practitioners of computer science
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
History
Q&A for historians and history buffs
Server Fault
Q&A for system and network administrators