Stack Overflow
百度 针对难易的调整，Kaufman则表示这是有意而为之。Q&A for professional and enthusiast programmers
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Code Review
Q&A for peer programmer code reviews
German Language
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Open Source
Q&A for people organizing, marketing or licensing open source development projects
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Politics
Q&A for people interested in governments, policies, and political processes
English Language Learners
Q&A for speakers of other languages learning English
Reverse Engineering
Q&A for researchers and developers who explore the principles of a system through analysis of its structure, function, and operation
Retrocomputing
Q&A for vintage-computer hobbyists interested in restoring, preserving, and using the classic computer and gaming systems of yesteryear
Puzzling
Q&A for those who create, solve, and study puzzles
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Computer Science
Q&A for students, researchers and practitioners of computer science
Mathematics
Q&A for people studying math at any level and professionals in related fields
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Server Fault
Q&A for system and network administrators
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Programming Language Design and Implementation
Q&A for designers and implementers of computer programming languages