We have released a simple tool that allows you to draw lines and shapes on the map and export them to a geojson file.
The map creator is available at https://free-map.org/creator/ and it’s based on Leaflet.draw library.
The tool provide users with the ability draw polygons on the map. You can editing existing polylines and polygons. And finally, you can export your map to a geojson file or print it.