These are commercial plugins, but in the tradition of Adaptavist's commercial plugins, we've made them free to anyone with a free Confluence license - so that's Starter, Non-Profit, Community, Open Source, Developer or Demonstration license holder.
And when we say free, we really mean it - the license lasts for a year and is free to renew too. We want you to make the most of Confluence to further your cause/project, and we give you access to all of our plugins for free to help you do just that.
To grab your free license, head on over to the Try our Buy page and select the option to 'Buy Wiki-plus Pack' - the shopping cart will see that you specify a free Confluence license type on the next page, will skip the payment stage and will just generate your license.
Have fun with them!