Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
The Great Outdoors
Q&A for people who love outdoor activities, excursions, and outdoorsmanship
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Physics
Q&A for active researchers, academics and students of physics
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Martial Arts
Q&A for students and teachers of all martial arts
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Gardening & Landscaping
Q&A for gardeners and landscapers
Signal Processing
Q&A for practitioners of the art and science of signal, image and video processing
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Programmers
Q&A for professional programmers interested in conceptual questions about software development
The Workplace
Q&A for members of the workforce navigating the professional setting
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
Homebrewing
Q&A for dedicated home brewers and serious enthusiasts
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
User Experience
Q&A for user experience researchers and experts
Game Development
Q&A for professional and independent game developers
Mathematics
Q&A for people studying math at any level and professionals in related fields
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Photography
Q&A for professional, enthusiast and amateur photographers
Personal Productivity
Q&A for people wanting to improve their personal productivity
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Sustainable Living
Q&A for folks dedicated to a lifestyle that can be maintained indefinitely without depleting available resources
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Philosophy
Q&A for those interested in logical reasoning
Writers
Q&A for authors, editors, reviewers, professional writers, and aspiring writers
Personal Finance & Money
Q&A for people who want to be financially literate
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Robotics
Q&A for professional robotic engineers, hobbyists, researchers and students