CTAN has a new package: prerex

[CTAN Announcements]

A new package has been installed at tug.ctan.org and should soon appear
at your favorite mirror.

Thanks again,
Jim Hefferon

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The following information was provided by the package's contributor.

Name of contribution: prerex-1.0
Author's name: Bob Tennent
Location on CTAN: /graphics/prerex
Summary description: macros and interactive editor for prerequisite charts
License type: lppl

Announcement text given by the package's contributor:
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This package consists of prerex.sty, a LaTeX style for producing charts 
of course nodes linked by arrows representing pre- and co-requisites, 
and prerex, an interactive program for creating and editing chart 
descriptions. This implementation of prerex.sty is built on pstricks; 
prerex is written in C. 
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