Stack Overflow
Q&A for professional and enthusiast programmers
Travel
Q&A for road warriors and seasoned travelers
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Super User
Q&A for computer enthusiasts and power users
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
MathOverflow
Q&A for professional mathematicians
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
Web Applications
Q&A for power users of web applications
Quantitative Finance
Q&A for finance professionals and academics
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Server Fault
Q&A for system and network administrators
The Great Outdoors
Q&A for people who love being outdoors enjoying nature and wilderness, and learning about the required skills and equipment
Home Improvement
Q&A for contractors and serious DIYers
Photography
Q&A for professional, enthusiast and amateur photographers
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
Expatriates
Q&A for people living abroad on a long-term basis
Arqade
Q&A for passionate videogamers on all platforms
Area 51
Q&A for proposing new sites in the Stack Exchange network
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
Ask Ubuntu
Q&A for Ubuntu users and developers
Personal Finance & Money
Q&A for people who want to be financially literate
Sustainable Living
Q&A for folks dedicated to a lifestyle that can be maintained indefinitely without depleting available resources
Gardening & Landscaping
Q&A for gardeners and landscapers
Spanish Language
Q&A for linguists, teachers, students and Spanish language enthusiasts in general wanting to discuss the finer points of the language
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Blender
Q&A for people who use Blender to create 3D graphics, animations, or games