MBarcode
mBarcode is an application which allows the user to scan several types of barcodes. It gives a number of options to use these codes through a set of plugins.
Post PR1.3 issues
Some users have reported problems loading plugins after upgrading their N900 device to PR1.3. A reinstall of the mbarcode package and the plugin packages (just reinstall mbarcode-plugins-all to fetch all default ones) has been reported to fix this issue.
With PR1.3 and the newest packages, mbarcode should work fine.
Developers
If you would like to get started on developing plugins for mBarcode, please check out our tutorial.