* (Simple) Calendar is now replaced by Simple Calendar Pro. While the app is still Open Source, code available on github and free on F-Droid, the Play Store release is now paid ([see this post by the developer](https://medium.com/@tibbi/some-simple-mobile-tools-apps-are-becoming-paid-d053268f0fb2)), thus the change. NanoDroid-wise the transistion is done in-place, but you will have to re-setup the application.