Formerly known as thepurplepixel.
I'm most active on SuperUser, but do venture around to other StackExchange sites from time to time.
Super User
Q&A for computer enthusiasts and power users
Travel
Q&A for road warriors and seasoned travelers
Server Fault
Q&A for system and network administrators
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Area 51
Q&A for proposing new sites in the Stack Exchange network
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Photography
Q&A for professional, enthusiast and amateur photographers
Network Engineering
Q&A for network engineers
Stack Overflow
Q&A for professional and enthusiast programmers
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Ask Ubuntu
Q&A for Ubuntu users and developers
Computer Science
Q&A for students, researchers and practitioners of computer science
Puzzling
Q&A for those who create, solve, and study puzzles
Aviation
Q&A for aircraft pilots, mechanics, and enthusiasts
Project Management
Q&A for project managers
Chess
Q&A for serious players and enthusiasts of chess
Information Security
Q&A for information security professionals
Mathematics
Q&A for people studying math at any level and professionals in related fields
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Ask Different
Q&A for power users of Apple hardware and software
WordPress Development
Q&A for WordPress developers and administrators
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts