foo2zjs (Printer Driver)

foo2zjs is an open source printer driver for printers that
use the Zenographics ZjStream wire protocol for their print data.
ZjStream printers are raster printers which happen to use a very
efficient wire protocol which was developed by Zenographics and
licensed by most major printer manufacturers for at least some
of their product lines. ZjStream is just one of many wire protocols
that are in use today, such as Postscript, PCL, Epson, etc.

http://foo2zjs.rkkda.com/