Defining quotes:
"The present letter is a very long one, simply because I had no leisure to make it shorter."
— Blaise Pascal
"The early bird gets the worm, but the second mouse gets the cheese."
—Steven Wright
"And yet what are we to do about this terribly significant business of other people."
— Philip Roth
Stack Overflow
Q&A for professional and enthusiast programmers
Super User
Q&A for computer enthusiasts and power users
Server Fault
Q&A for system and network administrators
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Ask Ubuntu
Q&A for Ubuntu users and developers
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Arqade
Q&A for passionate videogamers on all platforms
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Home Improvement
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Area 51
Q&A for proposing new sites in the Stack Exchange network
Web Applications
Q&A for power users of web applications
Video Production
Q&A for engineers, producers, editors and enthusiasts spanning the fields of video and media creation
Seasoned Advice
Q&A for professional and amateur chefs
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Project Management
Q&A for project managers
Skeptics
Q&A for scientific skepticism
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
SharePoint
Q&A for SharePoint enthusiasts
Mi Yodeya
Q&A for those who base their lives on Jewish law and tradition and anyone interested in learning more
Code Review
Q&A for peer programmer code reviews
Information Security
Q&A for information security professionals
Bricks
Q&A for LEGO® and building block enthusiasts
Travel
Q&A for road warriors and seasoned travelers
Poker
Q&A for serious players and enthusiasts of poker
Academia
Q&A for academics and those enrolled in higher education
Chinese Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Chinese language
Music: Practice & Theory
Q&A for musicians, students, and enthusiasts
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Graphic Design
Q&A for Graphic Design professionals, students, and enthusiasts
Photography
Q&A for professional, enthusiast and amateur photographers
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Game Development
Q&A for professional and independent game developers
Personal Finance & Money
Q&A for people who want to be financially literate
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
WordPress Development
Q&A for WordPress developers and administrators
Ask Different
Q&A for power users of Apple hardware and software
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
The Great Outdoors
Q&A for people who love being outdoors enjoying nature and wilderness, and learning about the required skills and equipment
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Physics
Q&A for active researchers, academics and students of physics
Writing
Q&A for the craft of professional writing, including fiction, non-fiction, technical, scholarly, and commercial writing
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Mathematics
Q&A for people studying math at any level and professionals in related fields
User Experience
Q&A for user experience researchers and experts