Super User
Q&A for computer enthusiasts and power users
Stack Overflow
Q&A for professional and enthusiast programmers
Server Fault
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Database Administrators
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Politics
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Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
WordPress Development
Q&A for WordPress developers and administrators
Music Fans
Q&A for music historians, critics, and fans