Super User
Q&A for computer enthusiasts and power users
Area 51
Q&A for proposing new sites in the Stack Exchange network
Stack Overflow
Q&A for professional and enthusiast programmers
Software Recommendations
Q&A for people seeking specific software recommendations
The Workplace
Q&A for members of the workforce navigating the professional setting
Network Engineering
Q&A for network engineers
Mathematics
Q&A for people studying math at any level and professionals in related fields
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Ask Ubuntu
Q&A for Ubuntu users and developers
Server Fault
Q&A for system and network administrators
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Politics
Q&A for people interested in governments, policies, and political processes
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization