Stack Overflow
Q&A for professional and enthusiast programmers
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Sustainable Living
Q&A for folks dedicated to a lifestyle that can be maintained indefinitely without depleting available resources
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Personal Finance & Money
Q&A for people who want to be financially literate
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Mi Yodeya
Q&A for those who base their lives on Jewish law and tradition and anyone interested in learning more
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Physics
Q&A for active researchers, academics and students of physics
Graphic Design
Q&A for professional graphic designers and non-designers trying to do their own graphic design
User Experience
Q&A for user experience researchers and experts
Audio-Video Production
Q&A for engineers, producers, editors, and enthusiasts spanning the fields of audio, video, and media creation
Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
Biology
Q&A for biology researchers, academics, and students
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
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Musical Practice & Performance
Q&A for musicians, students, and enthusiasts
Ask Patents
Q&A for people interested in improving and participating in the patent system
