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Ask Ubuntu
Q&A for Ubuntu users and developers
Stack Overflow
Q&A for professional and enthusiast programmers
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
Super User
Q&A for computer enthusiasts and power users
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Retrocomputing
Q&A for vintage-computer hobbyists interested in restoring, preserving, and using the classic computer and gaming systems of yesteryear
Software Recommendations
Q&A for people seeking specific software recommendations
Travel
Q&A for road warriors and seasoned travelers
Meta Stack Exchange
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
Mathematics
Q&A for people studying math at any level and professionals in related fields
Woodworking
Q&A for professional and amateur woodworkers
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Server Fault
Q&A for system and network administrators
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Arqade
Q&A for passionate videogamers on all platforms
Language Learning
Q&A for students, teachers, polyglots, and anyone interested in the techniques of second-language acquisition
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Information Security
Q&A for information security professionals
Open Source
Q&A for people organizing, marketing or licensing open source development projects
Engineering
Q&A for professionals and students of engineering
Vi and Vim
Q&A for people using the vi and Vim families of text editors