Domino Exporter Pro is the next generation of the product known as Notes XML Exporter, a product that was first developed in 2009. The current version, 2019.1 was released in the spring of 2019, and it introduced additional capabilities like the ability to export multiple databases in one folder, as well as recursive exports of databases in a folder structure.
The software is licensed by the number of documents that will be exported. This is the Unlimited version, with no limit o the number of documents you can export.
The buyer of the Unlimited version also gets up to three (3) hours of free customization/development, as well as a discounted hourly rate after that.