TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Server Fault
Q&A for professional system and network administrators
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Politics
Q&A for people interested in governments, policies, and political processes