English Language Learners
Q&A for speakers of other languages learning English
Stack Overflow
Q&A for professional and enthusiast programmers
Area 51
Q&A for proposing new sites in the Stack Exchange network
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Super User
Q&A for computer enthusiasts and power users
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Astronomy
Q&A for astronomers and astrophysicists
Server Fault
Q&A for system and network administrators
Ask Ubuntu
Q&A for Ubuntu users and developers
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Mathematics
Q&A for people studying math at any level and professionals in related fields
Code Review
Q&A for peer programmer code reviews
Game Development
Q&A for professional and independent game developers
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Hardware Recommendations
Q&A for people seeking specific hardware recommendations