Kindle DRM Removal (AZW/PRC/Mobi Drm Removal from removedrmfromepub) is a commercial tool that allows to remove DRM from
Kindle ebooks.
Haven't tried to use it, since freeware Kindle DRM removal plug-in for
Calibre works just fine. Besides Calibre can convert Kindle files to other ebooks formats, so you can read Kindle ebooks whether you use
Kindle,
Sony Reader,
Nook or some other reader.
Download freeware Kindle DRM removal plug-in for Calibre and freeware standalone Kindle DRM removal tools:
ebook DRM removal tools archive