Stack Overflow
Q&A for professional and enthusiast programmers
Super User
Q&A for computer enthusiasts and power users
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
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
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
Quantitative Finance
Q&A for finance professionals and academics
Server Fault
Q&A for system and network administrators
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Personal Finance & Money
Q&A for people who want to be financially literate