For notes I’m using Joplin with sync with desktop client through a nextcloud instance. Really a very nice app if you want sync with multiple devices anc user friendly interface.
For maps OsmAnd, I even pay a subscription to support the project (and have hourly updated maps which is pretty cool when I fix wood paths in openstreetmap).
As a Heliboard enthusiast and pretty happy with it, I would like to ask you what you find wrong with it, what you miss from the original ?