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HPGL-DXF
HPGL-DXF project can convert HPGL files into DXF format, which can be read by the likes of QCAD....
HPGL-Distiller
HPGL-Distiller is a small program that was written to filter out aspects of a HPGL file....
HPGS - HPGl Script
An HPGL/2 interpreter...
Chiplotle
A HPGL (Hewlett-Packard Graphics Language) Python API...