- LibraryThing
 - Online book catalogue application, using metatags and Library of Congress data, to allow users to build their own library catalogue, and to connect to other people sharing the same books. - Readerware
- A tool for readers and collectors to automatically catalogue collections using Internet databases.
- Niche Software Inc.
- Making collectibles software for a variety of interests.
- Collectify, LLC
- Specializes in cataloging software for collectors and hobbyists.
- Anteq Software Corporation
- Offers software for antique dealers, shops, malls and collectors.
- SJ Software Applications
- Offers a database program for cataloging collections as well as household items.
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