XXy is a WYSIWYG-editor for Xy-pic code, which is
used by the LaTeX package for typesetting graphs
and diagrams. It works on Xy-pic snippet files,
which can be included from a standard .tex file.
Information regarding Project Releases and Project Resources. Note that the information here is a quote from Freecode.com page, and the downloads themselves may not be hosted on OSDN.
