This is the VideApp-Var, as developed for the first module of Beethovens Werkstatt. Development took place roughly from 2015 to 2016, and is described in DOI 10.5281/ZENODO.13289742. The original name of the tool was just VideApp, and "-var" was added later to indicate the first module, which dealt with variation.
While this original VideApp inspired many later developments, it was never meant to be more than a prototype, and as such will not receive future updates and revisions, as most of the technology stack is seriously outdated. The version currently deployed at https://videapp-var.beethovens-werkstatt.de can be found in the /VideApp2016 folder.