Ant Movie Catalog - Ant Movie Catalog is a free, open-source program made to manage your collection of movies on DVD...
Evernote - Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.
Tellico - Tellico is a KDE application for organizing your collections.
allTags - allTags is a free, tag based file management application.
calibre - Ebook manager, viewer & converter
Tabbles - Tabbles use tags to organize and find files along with your colleagues.