Hewlett-Packard's Linux imaging and printing software
The Hewlett-Packard Linux Imaging and Printing Project provides a unified single and multi-function connectivity solution for Linux. For support and help, please visit https://launchpad.net/hplip
pcdtoppm is a modification of the pcdtojpeg Photo CD conversion utility (http://pcdtojpeg.sourceforge.net) that outputs PPM rather than JPEG.
unpaper is a post-processing tool for scanned sheets of paper, especially for book-pages scanned from previously created photocopies. unpaper tries to remove dark edges, corrects the rotation ("deskew"), and aligns the centering of pages.
A collection of enhanced PPD files for Canon Pixma MP600 and MP610 all-in-one printers, and a Sane scanner driver for Canon Pixma MP140, MP210, MP520, MP610, MP710, MX700 for up to 4800 dpi resolution, that can be used with Sane 1.0.18 or 1.0.19.