Thanks to all who replied!
The answer was unanimous: hp2xx
This utility is produced by the GNU group.
Here was the winning post (First one received):
>From uunet!vitsemi.com!vitsemi.com!chess Thu Sep 30 14:50:10 1993
>From: uunet!vitsemi.com!chess (Julie Reilly)
>Content-Length: 4032
>
>I saw this posted TODAY in the gnu.announce newsgroup!
>
>J. Reilly
>chess@vitsemi.com
>
>
>Version 3.1.3 of the GNU HP-GL converter "hp2xx" is now available for
>anonymous ftp from clio.rz.uni-duesseldorf.de [134.99.128.3]
>in the file ./hp2xx/hp2xx-3.1.3.tar.Z
>
>GNU hp2xx reads HP-GL files, decomposes all drawing commands into
>elementary vectors, and converts them into a variety of vector and raster
>output formats. It is also a HP-GL previewer. Currently supported are:
>
> Vector formats:
> Encapsulated PostScript
> Uniplex RGIP
> Metafont, and various special TeX-related formats
> Simplified HP-GL (line drawing only), for imports
>
> Raster formats:
> IMG, PBM, PCX, HP-PCL (including Deskjet & DJ5xxC support)
>
> Previewers:
> UNIX: X11, OS/2: PM & Full-screen, DOS: (S)VGA & HGC,
> ATARI, AMIGA, VAX: UIS
>
>Version 3.1.3 contains fixes and various new features (most of which
>have been available as "fixes" during the last weeks), in particular:
>
> * New formats:
> o hgc Monochrome Hercules graphics for previewing now supported
> o rgip Uniplex RGIP vector format
> o hpgl Simplified HP-GL output, useful for later imports
>
> * HP-PLC format:
> o Compression added in Deskjet modes
> o Debugged
> * EPS format:
> o BoundingBox corrected for pen width
>
> * HP-GL commands:
> o EA (rectangle): new; LT (line type) , LB/PR: debugged
>
> * Hp2xx options:
> o --version added to conform to GNU
> o -P n:m (page range) improved
> * OS specifics:
> o VAX-VMS: Improved support; previewer corrected
> o OS/2: Full-screen preview added; PM preview adapted to emx 0.8g
> o OS/2: Simple yet nasty bug removed: Binary outputs now ok!
> o UNIX: Better support when in pipe mode
>
>For details, see file ./hp2xx/changes
>Please note that the ftp server "clio" is overloaded -- don't try to access
>it directly except at off-office hours (18:00 - 08:00 GMT+1), or better:
>
> *** Wait until the hp2xx files are copied
> *** to the major GNU distribution sites -- Thanks !
>
>
>Please send contributions and bug reports directly to me at:
>
> werntges@convex.rz.uni-duesseldorf.de
>
>
>My thanks to all contributors and helpful users who made many of the
>above improvements possible!
>Enjoy,
>
> -- Heinz
>
>
>[ Most GNU software is packed using the new `gzip' compression program.
> Source code is available on most sites distributing GNU software.
>
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>
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>The above software will soon be at these ftp sites as well.
> Please try them before prep.ai.mit.edu! thanx -gnu@prep.ai.mit.edu
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