On the web I'm known as RGB, RGB-es or el pingüino tolkiano (the Tolkian Penguin). I write, mostly in Spanish but also in English and Italian, about free software, text processing and typography.
I'm the author of a CC licensed book that explains how to use LibreOffice Writer (and talks a bit about Math, Draw and Chart). Originally written in Spanish as Domando al escritor (Taming the Writer), there is an old Italian translation, and a shiny English edition: To Tame a Writer.
I'm also the author of a book about LyX, LaTeX, XeTeX and OpenType. The original Spanish edition is LyX, la otra forma de escribir, but it has been translated into English as LyX, The Other Way of Writing.
Meanwhile I keep writing in my blogs, mainly about free software but also about science, education, photography... whatever I can think of.