The French Data Protection Authority (CNIL) has just released an open-source software relating to the conduct of a privacy impact assessment (PIA). The software is meant to guide the data controllers in building and demonstrating compliance to the GDPR. It helps to properly carry out a data protection impact assessment by facilitating the use of the PIA method developed by the CNIL. Although the download link is in French, the software is available in both English and French.
A video tutorial (in French only) is available here: https://www.youtube.com/watch?v=art3RNtXxeI&feature=youtu.be
The software can be downloaded on the following page: https://www.cnil.fr/fr/outil-pia-telechargez-et-installez-le-logiciel-de-la-cnil