Vacation management - urlaubsverwaltung.cloud
I found an App called urlaubsverwaltung.cloud, it is vacation management solution, available as Docker image and licensed under Apache-2.0.
It also has a LDAP integration and could be a great App for Cloudron.
@paridata There is a module integrated into Odoo Community Edition and also Flectra, which handles vacations. It is/was called "Leaves" or "Time Off". The name changes with editions.
Both these applications are still waiting in the "App Wish List".