HPGL Import for Rhino 

HPGL Import for Rhino is a plug-in for Rhino. This plug-in gives Rhino the ability to import graphical data from HPGL Plot (PLT) files.
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Acme CAD Converter 

Batch Convert DWG/DXF/DWF to PDF/BMP/JPEG/GIF/PLT/HP-GL/SVG/CGM/EPS, It can conveniently convert DXF,DWF and DWG files into BMP, GIF,JPEG, DXF, DWG, SVG, PDF, HPGL, CGM, EPS etc., and also enable the conversion between DXF and DWG file versions (R2.5-R2006).
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Konvertor 

Konvertor is a file converter. Konvertor reads and converts between 1084 different formats: 989 graphic formats (JPM,BM, PCD, K25, PSD, TGA, HPGL, PDF, GIF, JPEG-2000, VRML...), 95 audio, text and video formats (MID,WMA,MP3,DALET,WAV,TXT, AVI,ASF...)
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Raster to Vector Normal 

Raster to Vector Normal converts scanned drawings and raster images (such as BMP, JPG, TIF, GIF, etc) into vector formats (such as DXF, HPGL, EMF, etc). You can scan old plans, archive drawings, or even photos and convert them into useful CAD data.
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BMP to DXF 

BMP to DXF converts images (such as BMP, JPG, TIF, GIF, etc) into AutoCAD formats (such as DXF, HPGL, etc). You can scan old plans, archive drawings, or even photos and convert them into useful CAD data.
bmp to dxf jpg to dxf jpg to dwg jpeg to dxf bmp to dwg

DISGCL PostScript Manual 

The program DISGCL is an interpreter based on the data plotting library DISLIN. All DISLIN statements can be written to a script file and then be executed with DISGCL, or can be entered in an interactive mode.
scientific plotting programming