PressBooks, the DIY self-publishing tool built on WordPress, is going open source. The digital publisher has plans to release a WordPress plugin under the open source GPL license around the end of January that will let the authors and publishers who use the tool create their own fully-customizable version of PressBooks.

The publisher has four reasons for wanting to make its tool open including to be a part of promoting books on the open web. Here is more from the PressBooks blog: “We believe the future of books requires new models, and new models need open platforms to allow publishers and authors to experiment. We believe that an open source PressBooks will result in better technology for the world. We believe that an open source PressBooks will result in better business for us.”

The platform will still be free, but users can opt to pay PressBooks for hosting and maintaining their content for a fee.