Software Engineer/Programmer/Developer and all that applies ;-)
If you judge books by their cover:
Windows/Unix? Unix
BSD/Linux? BSD
Vim/Emacs? Vim
MySQL/PostgreSQL? PostgreSQL
Perl/Python? Python
Ruby/Django? Django
BSD/GPL? BSD
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Ask Different
Q&A for power users of Apple hardware and software
Software Quality Assurance & Testing
Q&A for software quality control experts, automation engineers, and software testers
Server Fault
Q&A for professional system and network administrators
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
User Experience
Q&A for user experience researchers and experts
German Language & Usage
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
