The teTeX package and Emacs editor are recommended for Linux systems, such as Fedora, the MikTeX package and WinEdt editor are recommended for Windows, and the OzTeX package is recommended for Mac. Many guides to LaTeX document preparation and samples are available:
AMS TeX Resources
OpenOffice.org free download (Windows/Mac/Linux) for Microsoft Office compatible software suite.
University of Cambridge - Engineering Department
University of Oxford - Mathematical Institute
Wikipedia LaTeX Guide