English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Stack Overflow
Q&A for professional and enthusiast programmers
Writers
Q&A for authors, editors, reviewers, professional writers, and aspiring writers
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
English Language Learners
Q&A for speakers of other languages learning English
Physics
Q&A for active researchers, academics and students of physics
Sustainable Living
Q&A for folks dedicated to a lifestyle that can be maintained indefinitely without depleting available resources
Photography
Q&A for professional, enthusiast and amateur photographers
Server Fault
Q&A for professional system and network administrators
Mathematics
Q&A for people studying math at any level and professionals in related fields
Politics
Q&A for people interested in governments, policies, and political processes
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Open Data
Q&A for developers and researchers interested in open data
Graphic Design
Q&A for professional graphic designers and non-designers trying to do their own graphic design
Chemistry
Q&A for scientists, academics, teachers and students
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Personal Finance & Money
Q&A for people who want to be financially literate
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Reverse Engineering
Q&A for researchers and developers who explore the principles of a system through analysis of its structure, function, and operation
Sports
Q&A for participants in team and individual sport activities