Catalogs

Music Collector
Collectorz(Trial version)
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Organize and Catalogue Your Music Collection with Music Collector
CodeX Apps
Codexapps(Trial version)
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The only organizer you'll ever need
Books
Books(Free)
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An Open-Source Book Cataloging Application
DiskTracker
Portents(Trial version)
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DiskTracker: Keep Track of Your Removable Files and Folders
DVD Cache
Humantrained(Free)
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Organize your DVD collection with DVD Cache
MacFamilyTree
Synium Software(Demo)
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Discover your family tree with MacFamilyTree
iMedia Browser
Karelia(Trial version)
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iMedia Browser: Preview all your media
Nifty Box
Nifty-box(Trial version)
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Tagging without the mess
Book Hunter
joel-ares(Free)
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Organize your book collection more easily
DiskLibrary
Obviousmatter(Trial version)
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DiskLibrary: Fun and Easy Media Cataloging