Professional web developer.
Mostly php (CakePHP team member), some node.js, various databases/datastores - and a dash of linux (arch with a smidgen of ubuntu server).
Stack Overflow
Q&A for professional and enthusiast programmers
Server Fault
Q&A for system and network administrators
Code Review
Q&A for peer programmer code reviews
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Information Security
Q&A for information security professionals
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Philosophy
Q&A for those interested in the study of the fundamental nature of knowledge, reality, and existence
Ask Different
Q&A for power users of Apple hardware and software
Area 51
Q&A for proposing new sites in the Stack Exchange network