A utility that adds manual duplex to the "Print" menu
gnome-manual-duplex is a utility that adds manual duplex to the "Print" menu. It is a CUPS Virtual Printer as well as a standalone utility. It works with *.ps and *.pdf files.
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Stylus Toolbox is an Epson inkjet printerutility. It shows ink levels, allows you to clean and align your print heads, and to perform a nozzle check. As it is a graphical front-end for escputil, it supports all Epson printers supported by Gutenprint.