Collector is a collection manager for your desktop, is available for Linux, Mac and Windows.
Collector isn't full functionally and needs some improvements to be a complete, by the moment it has only one collection: Boardgames Collection.
Note
Project has not been maintained in the past years and right now it may not be usable. On October 2020, this project is bring back to live...
Download the latest executable/package from the website: http://www.collector.cat
Clone this repo using --recursive:
https://github.com/arielvb/collector
If you forget the --recursive, then init and update the submodules by hand:
git submodule update --init
Read the developer guide at http://www.collector.cat/dev/ (in Catalan only)