LatLege is a Latin study app created in affiliation with JCLSource. LatLege allows you to view all the grammar charts, practice them, and learn and review vocab (organized by Cambridge Latin Course stages, difficulty, or category). LatLege will be available on macOS (High Sierra or higher), Windows (8 or higher), iOS (13), and any browser. I may also create an Android app (don't know version yet), and Linux.
Click here to access LatLege.