Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
German Language & Usage
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
User Experience
Q&A for user experience researchers and experts
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Graphic Design
Q&A for professional graphic designers and non-designers trying to do their own graphic design
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Server Fault
Q&A for professional system and network administrators
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Drupal Answers
Q&A for Drupal developers and administrators
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Photography
Q&A for professional, enthusiast and amateur photographers
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
Philosophy
Q&A for those interested in logical reasoning
The Great Outdoors
Q&A for people who love outdoor activities, excursions, and outdoorsmanship
Answers OnStartups
Q&A for entrepreneurs looking to start or run a new business
English Language Learners
Q&A for speakers of other languages learning English
Academia
Q&A for academics and those enrolled in higher education
Sustainable Living
Q&A for folks dedicated to a lifestyle that can be maintained indefinitely without depleting available resources
Ask Patents
Q&A for people interested in improving and participating in the patent system
Genealogy & Family History
Q&A for expert genealogists and people interested in genealogy or family history
Libraries & Information Science
Q&A for librarians and library professionals
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
The Workplace
Q&A for members of the workforce navigating the professional setting
Personal Productivity
Q&A for people wanting to improve their personal productivity