Elected moderator on Unix & Linux.
I've been using Linux since the late '90s and have gone through a variety of distributions. At one time or another, I've been a user of Mandrake, SuSe, openSuSe, Fedora, RedHat, Ubuntu, Mint, Linux Mint Debian Edition (basically Debian testing but more green) and, for the past few years, Arch.
My Linux expertise, such as it is, is mostly on manipulating text and regular expressions since that represents a large chunk of my daily work.
Unix & Linux ♦
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Super User
Q&A for computer enthusiasts and power users
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Biology
Q&A for biology researchers, academics, and students
Bioinformatics ♦
Q&A for researchers, developers, students, teachers, and end users interested in bioinformatics
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Stack Overflow
Q&A for professional and enthusiast programmers
Academia
Q&A for academics and those enrolled in higher education
Politics
Q&A for people interested in governments, policies, and political processes
Stack Overflow en español
Preguntas y respuestas para programadores y profesionales de la informática
Open Source
Q&A for people organizing, marketing or licensing open source development projects
The Workplace
Q&A for members of the workforce navigating the professional setting
Law
Q&A for legal professionals, students, and others with experience or interest in law
Emacs
Q&A for those using, extending or developing Emacs
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Music: Practice & Theory
Q&A for musicians, students, and enthusiasts
Personal Finance & Money
Q&A for people who want to be financially literate
Chemistry
Q&A for scientists, academics, teachers, and students in the field of chemistry
Travel
Q&A for road warriors and seasoned travelers
English Language Learners
Q&A for speakers of other languages learning English
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
Beer, Wine & Spirits
Q&A for alcoholic beverage aficionados and those interested in beer, wine, or spirits
Area 51
Q&A for proposing new sites in the Stack Exchange network
Medical Sciences
Q&A for professionals in medical and allied health fields, students of those professions, related academics, and others with a sound understanding of medicine and healthcare-related sciences
Chess
Q&A for serious players and enthusiasts of chess
Philosophy
Q&A for those interested in the study of the fundamental nature of knowledge, reality, and existence
Software Recommendations
Q&A for people seeking specific software recommendations
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Writing
Q&A for the craft of professional writing, including fiction, non-fiction, technical, scholarly, and commercial writing
Code Review
Q&A for peer programmer code reviews
Spanish Language
Q&A for linguists, teachers, students and Spanish language enthusiasts in general wanting to discuss the finer points of the language
Latin Language
Q&A for linguists, teachers, and students wanting to discuss the finer points of the Latin language
Mi Yodeya
Q&A for those who base their lives on Jewish law and tradition and anyone interested in learning more
Interpersonal Skills
Q&A for people looking to improve their interpersonal communication skills
Server Fault
Q&A for system and network administrators
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Pets
Q&A for pet owners, caretakers, breeders, veterinarians, and trainers
Community Building
Q&A for community managers, administrators, and moderators
Ask Different
Q&A for power users of Apple hardware and software
Mathematics
Q&A for people studying math at any level and professionals in related fields
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Physics
Q&A for active researchers, academics and students of physics
Space Exploration
Q&A for spacecraft operators, scientists, engineers, and enthusiasts
Seasoned Advice
Q&A for professional and amateur chefs
Information Security
Q&A for information security professionals
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Literature
Q&A for scholars and enthusiasts of literature
Graphic Design
Q&A for Graphic Design professionals, students, and enthusiasts
Aviation
Q&A for aircraft pilots, mechanics, and enthusiasts
Earth Science
Q&A for those interested in the geology, meteorology, oceanography, and environmental sciences
Arqade
Q&A for passionate videogamers on all platforms
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Astronomy
Q&A for astronomers and astrophysicists
Puzzling
Q&A for those who create, solve, and study puzzles
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
User Experience
Q&A for user experience researchers and experts
History of Science and Mathematics
Q&A for people interested in the history and origins of science and mathematics
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
Computer Science Educators
Q&A for those involved in the field of teaching Computer Science
Internet of Things
Q&A for builders and users of networked sensors and control devices in the contexts of smart homes, industry automation, or environmental sensors
Mythology & Folklore
Q&A for enthusiasts and scholars of mythology and folklore
Blender
Q&A for people who use Blender to create 3D graphics, animations, or games
Web Applications
Q&A for power users of web applications
Stack Overflow на русском
Вопросы и ответы для программистов
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Mathematica
Q&A for users of Wolfram Mathematica
Martial Arts
Q&A for students and teachers of all martial arts
The Great Outdoors
Q&A for people who love being outdoors enjoying nature and wilderness, and learning about the required skills and equipment
Italian Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Italian language
DevOps
Q&A for software engineers working on automated testing, continuous delivery, service integration and monitoring, and building SDLC infrastructure
French Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the French language
Psychology & Neuroscience
Q&A for practitioners, researchers, and students in cognitive science, psychology, neuroscience, and psychiatry
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Computer Science
Q&A for students, researchers and practitioners of computer science
Hardware Recommendations
Q&A for people seeking specific hardware recommendations
Bioacoustics
Q&A for people interested in the studies of non-human animal sounds and the impacts of sounds on animals
elementary OS
Q&A for developers and users of elementary OS and applications
Music Fans
Q&A for music historians, critics, and fans