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LaTeX
LaTeX is a document preparation system and document markup language. LaTeX uses the TeX typesetting program for formatting its output, and is itself written in the TeX macro language. LaTeX is not the name of a particular editing program, but refers to the encoding or tagging conventions that are used in LaTeX documents. LateX is very suitable for producing scientific and mathematical documents of high typographical quality. It is also suitable for producing all sorts of other documents, from simple letters to complete books.
Guides
Not So Short Introduction to LaTex
Usefull Tools
Online editor for collaboration
popular LaTeX distributions
There are a few different LaTeX distrubutions out there for various operating systems. On GNU/linux tex-live is a common distribution whereas MikTex was developed to run especially on Microsoft Windows.
A distribution also installs a few or quiet a few, depending on your choice, of packeages for LaTeX to use.