Typically ‘free’ plugins come in a few flavors useful or enough to get you to pay for what you really need. This plugin offers a unique solutions to a number of Inventory uses and displays for free, no fuss or muss about it.
However paying for a license opens up support for one year and allows addition of the addons if desired. Let me just say for the meager cost of $15 for a year of support the team is everything you would want from a development group and customer service team rolled into one.
Look forward to using this plugin for a long time to come.