Stack Overflow
Q&A for professional and enthusiast programmers
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
Server Fault
Q&A for professional system and network administrators
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.
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Mathematics
Q&A for people studying math at any level and professionals in related fields
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Computer Science
Q&A for students, researchers and practitioners of computer science
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Personal Finance & Money
Q&A for people who want to be financially literate
Personal Productivity
Q&A for people wanting to improve their personal productivity
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
German Language & Usage
Q&A for speakers of German wanting to discuss the finer points of the language and translation
