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* Viewer.

 * DjVuLibre (all OS).
 * WinDjvu (Windows).

* Editor.

 * DjVuLibre (all OS).
 * DjVu Solo (Windows).

* DjVuLibre.

 * A full set of utilities to manipulate and assemble DjVu images and
   documents.
 * A set of decoders to convert DjVu to a number of other formats.
 * A standalone DjVu viewer for Unix under X11 (based on the Qt library).
 * A browser plugin that works with most Unix browsers

  http://djvu.sourceforge.net/

* DjVu Solo.

Tool for editing and merge files and documents in DjVu format from LizardTech.
Currently not maintained.

  http://www.djvu.org/resources/