Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
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
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
Server Fault
Q&A for professional system and network administrators
Programmers
Q&A for professional programmers interested in conceptual questions about software development
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
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
The Workplace
Q&A for members of the workforce navigating the professional setting
Computer Science
Q&A for students, researchers and practitioners of computer science
Personal Productivity
Q&A for people wanting to improve their personal productivity
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Answers OnStartups
Q&A for entrepreneurs looking to start or run a new business
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
French Language & Usage
Q&A for students, teachers, and linguists wanting to discuss the finer points of the French language