I'm a retired Portuguese electrical engineer.
You can contact me at acltavares[at]sapo[dot]pt
Mathematics
Q&A for people studying math at any level and professionals in related fields
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Physics
Q&A for active researchers, academics and students of physics
WordPress Answers
Q&A for WordPress developers and administrators
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Stack Overflow
Q&A for professional and enthusiast programmers
Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
German Language & Usage
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Academia
Q&A for academics and those enrolled in higher education
Computer Science
Q&A for students, researchers and practitioners of computer science
French Language & Usage
Q&A for students, teachers, and linguists wanting to discuss the finer points of the French language
