Online LaTeX editor for collaborative editing, great for Maths or Sciences. Many resources on the site too, including templates, help-guides, and links.
This document tries to show some possible solutions for creating screen based presentations. Most of the listed solutions are LaTeX-based because I personally prefer LaTeX - and derived tools - over other documentation systems.
This database provides style files (bst and sty) for use with LaTeX documents using BibTeX or AMSrefs to manage the bibliography. The styles are referenced by the academic journals to which they apply.