Stack Overflow
Q&A for professional and enthusiast programmers
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Mathematics
Q&A for people studying math at any level and professionals in related fields
User Experience
Q&A for user experience researchers and experts
Ask Different
Q&A for power users of Apple hardware and software
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Physics
Q&A for active researchers, academics and students of physics
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
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Answers OnStartups
Q&A for entrepreneurs looking to start or run a new business
German Language & Usage
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Personal Finance & Money
Q&A for people who want to be financially literate
