Emacs
Q&A for those using, extending or developing Emacs
Blender
Q&A for people who use Blender to create 3D graphics, animations, or games
Stack Overflow
Q&A for professional and enthusiast programmers
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Super User
Q&A for computer enthusiasts and power users
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Biology
Q&A for biology researchers, academics, and students
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Ask Ubuntu
Q&A for Ubuntu users and developers
Chemistry
Q&A for scientists, academics, teachers, and students in the field of chemistry
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Server Fault
Q&A for system and network administrators
Vi and Vim
Q&A for people using the vi and Vim families of text editors
Project Management
Q&A for project managers
Skeptics
Q&A for scientific skepticism
Information Security
Q&A for information security professionals
Code Review
Q&A for peer programmer code reviews
Graphic Design
Q&A for Graphic Design professionals, students, and enthusiasts
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
DevOps
Q&A for software engineers working on automated testing, continuous delivery, service integration and monitoring, and building SDLC infrastructure
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites