TagSpaces - TagSpaces is an open source platform for personal data management. With TagSpaces you can manage and organize the files on your laptop, tablet or smart phone.
DiskCatalogMaker - Simple, smart and fast disc management tool.
allTags - allTags is a free, tag based file management application.
Virtual Volumes View - VVV uses a relational database to store its data.
Elyse - The free version allows up to 30 tags.
Where Is It? - WhereIsIt is a Windows application, designed to organize and maintain a catalog of your computer media collection, including CD-ROMs, audio CDs, MP3s, removable disks...