Tellico is a KDE application for keeping track of your collections.  It 
provides default templates for books, bibliographies, videos, music, coins, 
stamps, trading cards, comic books, and wines.  Ultimately, the goal is for
it to be similar in capability to AVCataloger or Readerware, although it's 
still got a ways to go.

Tellico allows you to enter your collection in a catalogue database, saving 
many different properties like title, author, etc. Two different views of 
your collection are shown. On the left, your entries are grouped together by 
any field you like, allowing you to see how many are in each group. On the 
right, selected fields are shown in column format, allowing you to sort by any 
field. On the bottom is a customizable HTML view of the current entry. The 
entry editor is a dialog box where you enter the data.

You can even read barcodes with a webcam. The script enable this feature.

Recommended (but no hard dependencies) for tellico are the yaz programmer
toolkit and qjson libraries. They are not included in stock Slackware but
available at SlackBuilds.org.