Stack Overflow
Q&A for professional and enthusiast programmers
Mathematics
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TeX - LaTeX
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Super User
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Computer Science
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Arqade
Q&A for passionate videogamers on all platforms
Information Security
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Physics
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Computer Graphics
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Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
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Aviation
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Game Development
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English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Graphic Design
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Reverse Engineering
Q&A for researchers and developers who explore the principles of a system through analysis of its structure, function, and operation
Video Production
Q&A for engineers, producers, editors and enthusiasts spanning the fields of video and media creation
Blender
Q&A for people who use Blender to create 3D graphics, animations, or games
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
The Great Outdoors
Q&A for people who love being outdoors enjoying nature and wilderness, and learning about the required skills and equipment
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Travel
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Network Engineering
Q&A for network engineers
Photography
Q&A for professional, enthusiast and amateur photographers
History
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Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Politics
Q&A for people interested in governments, policies, and political processes
Open Source
Q&A for people organizing, marketing or licensing open source development projects
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Role-playing Games
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Mythology & Folklore
Q&A for enthusiasts and scholars of mythology and folklore
Robotics
Q&A for professional robotic engineers, hobbyists, researchers and students
Web Applications
Q&A for power users of web applications
Signal Processing
Q&A for practitioners of the art and science of signal, image and video processing
Server Fault
Q&A for system and network administrators
Writing
Q&A for the craft of professional writing, including fiction, non-fiction, technical, scholarly, and commercial writing
English Language Learners
Q&A for speakers of other languages learning English