Stack Overflow
Q&A for professional and enthusiast programmers
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
The Workplace
Q&A for members of the workforce navigating the professional setting
Puzzling
Q&A for those who create, solve, and study puzzles
Super User
Q&A for computer enthusiasts and power users
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Pets
Q&A for pet owners, caretakers, breeders, veterinarians, and trainers
Physics
Q&A for active researchers, academics and students of physics
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Server Fault
Q&A for system and network administrators
French Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the French language
User Experience
Q&A for user experience researchers and experts
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Web Applications
Q&A for power users of web applications