Here’s Graeme Gill’s icclib, which’s main focus the the manipulation of ICC profiles. Graeme also has a small document he calls “What’s wrong with the ICC profile format?” on his page.
Wolf Faust has IT8.7 targets for a pretty good price available. He also collects links to free CM systems at http://www.coloraid.de. And he’s written a CMS system for the Amiga. If you order a target from him don’t forget to request a floppy disk formatted for Linux (or MSDOS). By default he sends out Amiga formatted disks.
The Behrmann site provides many informations around colour management on Linux, including actual news, tutorials, a CMS draft, the open source ICC Examin tool and a link collection.
Here’s information about the (now dormant) Gnome gcmm. But even more important you can find information about the patent situation regarding CMS. The actual gcmm code can be found in the Gnome CVS repository.
Argyll is an experimental, open source, ICC compatible color management system. It supports accurate ICC profile creation for scanners, CMYK printers, and film recorders. Profile linking uses the latest CIECAM97 appearance model, a new gamut mapping algorithm, and a wide selection of rendering intents. It also includes code for the fastest portable 8 bit raster color conversion engine available anywhere.