Stack Overflow
Q&A for professional and enthusiast programmers
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
User Experience
Q&A for user experience researchers and experts
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Gardening & Landscaping
Q&A for gardeners and landscapers
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Ask Different
Q&A for power users of Apple hardware and software
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Mathematics
Q&A for people studying math at any level and professionals in related fields
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
Computer Science
Q&A for students, researchers and practitioners of computer science
Personal Finance & Money
Q&A for people who want to be financially literate
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
Quantitative Finance
Q&A for finance professionals and academics
Server Fault
Q&A for professional system and network administrators
