Map Places is developed as an Open Source project on GitHub. It integrates Google Sheets with Google Maps so that when you add or delete locations from the app they appear in Google Sheets.
You can also share your sheet easily with anyone, and they can just add the list by copy pasting the link to the sheet.
It is ideal for orienteering, pub crawls and small lists locations shared with friends.
By creating a location on the app you also create your first Google Sheet for the app. Remember that if you have a pre-existing sheet named "My Map Places" there might be some unexpected consequences or even messing up of your previous sheet.
On Google Sheets:
You should also not edit ID field, name of the sheets within, or add a location in between empty lines as all of these might have some unexpected consequences if you add a sheet to the app. However you can edit everything else just remember that you should only try out names found in this list https://github.com/FistOfTheNorthStar/MapPlaces/blob/master/MapPlaces/fa.swift or you wont anything displaying on the map.
The project is very much under development and if you are a developer you are more than welcome to join. Check the GitHub URL.
If you wish to use the app for any purpose you may. It is licensed under MIT license https://opensource.org/licenses/MIT