Downloading Postcard_Database 1.1 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this Mac application is Andy Drabble.
The following version: 1.1 is the most frequently downloaded one by the program users. We recommend checking the downloaded files with any free antivirus. The program is included in Lifestyle Tools. This app's bundle is identified as com.winkybag.postcarddatabase.
From the developer:
Postcard Database stores details of your Postcard collection
in a relational database.
Supports searching on a number of criteria.
You may want to check out more software for Mac, such as Moose - by M. Uli Kusterer, which might be related to Postcard_Database.