TeX user since 1989, mostly LaTeX. For some time maintainer of pdfTeX, since then a close friend of the LuaTeX team.
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Academia
Q&A for academics and those enrolled in higher education
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Server Fault
Q&A for professional system and network administrators
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Graphic Design
Q&A for professional graphic designers and non-designers trying to do their own graphic design
Politics
Q&A for people interested in governments, policies, and political processes
Ask Patents
Q&A for people interested in improving and participating in the patent system
Android Enthusiasts
Q&A for enthusiasts and power users of the Android operating system
Ask Different
Q&A for power users of Apple hardware and software
Physics
Q&A for active researchers, academics and students of physics
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Sports
Q&A for participants in team and individual sport activities
Game Development
Q&A for professional and independent game developers
User Experience
Q&A for user experience researchers and experts
Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
Home Improvement
Q&A for contractors and serious DIYers
Photography
Q&A for professional, enthusiast and amateur photographers
WordPress Answers
Q&A for WordPress developers and administrators
Mi Yodeya
Q&A for those who base their lives on Jewish law and tradition and anyone interested in learning more
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Mathematics
Q&A for people studying math at any level and professionals in related fields
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
German Language & Usage
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Reverse Engineering
Q&A for researchers and developers who explore the principles of a system through analysis of its structure, function, and operation
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
The Great Outdoors
Q&A for people who love outdoor activities, excursions, and outdoorsmanship
Audio-Video Production
Q&A for engineers, producers, editors, and enthusiasts spanning the fields of audio, video, and media creation
Computational Science
Q&A for scientists using computers to solve scientific problems
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Writers
Q&A for authors, editors, reviewers, professional writers, and aspiring writers
Quantitative Finance
Q&A for finance professionals and academics
Software Quality Assurance & Testing
Q&A for software quality control experts, automation engineers, and software testers
Computer Science
Q&A for students, researchers and practitioners of computer science
The Workplace
Q&A for members of the workforce navigating the professional setting
Chemistry
Q&A for scientists, academics, teachers and students
Biology
Q&A for biology researchers, academics, and students
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
Musical Practice & Performance
Q&A for musicians, students, and enthusiasts
