Downloading Plottergeist 3.0 from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this software available. The program lies within System Utilities, more precisely Automation. This software was originally developed by Aphena Ltd. We recommend checking the downloaded files with any free antivirus.
From the developer:
Plottergeist understands HPGL and HPGL/2, and has built-in support for emulation of HP 7440, HP 7470, HP 7475, HP 7550 and HP 7570 pen-plotters. The common ANSI and ISO paper sizes are selected from a list (A..D, A4..A0, and custom size), and the useable plot area is reported to the controlling instrument when requested.
You may want to check out more software, such as Hibernate Trigger, AutoDialogs or IntegryDESK, which might be related to Plottergeist.