Stack Overflow
Q&A for professional and enthusiast programmers
Area 51
Q&A for proposing new sites in the Stack Exchange network
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Seasoned Advice
Q&A for professional and amateur chefs
English Language Learners
Q&A for speakers of other languages learning English
Aviation
Q&A for aircraft pilots, mechanics, and enthusiasts
Politics
Q&A for people interested in governments, policies, and political processes
Code Review
Q&A for peer programmer code reviews
The Workplace
Q&A for members of the workforce navigating the professional setting
Puzzling
Q&A for those who create, solve, and study puzzles
Emacs
Q&A for those using, extending or developing Emacs
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Woodworking
Q&A for professional and amateur woodworkers
Super User
Q&A for computer enthusiasts and power users
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Information Security
Q&A for information security professionals
Mathematics
Q&A for people studying math at any level and professionals in related fields
Photography
Q&A for professional, enthusiast and amateur photographers
History
Q&A for historians and history buffs
Genealogy & Family History
Q&A for expert genealogists and people interested in genealogy or family history