DjVu - Actually from AT&T (Score 1)

DjVu was actually developed by AT&T Labs - Research. http://djvu.research.att.com/ well over a year ago. They've released it to various other companies to comercialize it. Since the folks at AT&T Labs are (not surprisingly) big Unix users there is support for the various Unix flavors, including Linux. You can get more technical information than you want by going to their website. (one note: Also not surprisingly, most of their technical documents about DjVu are in DjVu format, so you'll need to get the plugin, either from AT&T or LizardTech.)

Disclaimer: I used to work at AT&T Labs as an outside contractor in their library.