Our website provides a free download of hpgs 1.1.8. The following version: 1.1 was the most frequently downloaded one by the program users. The program belongs to Photo & Graphics Tools. This free software was originally designed by ev-i Informationstechnologie GmbH.
From the developer:
HPGS is an HPGL/2 interpreter, which renders HPGL/2 through a Postscript-like API. Currently, it can render to eps and png files. For rendering the scenery to pixel formats, a rendering engine has been coded, which draws vector graphics into pixel buffers
You may want to check out more software, such as Hammerhead Pool To Go, TotalCADConverter or Total CAD Printer, which might be similar to hpgs.