@Cycrev - So it IS proprietary, but it does not cost money if you join their group.
That said!!! Yes!!! I do know an app that's not proprietary!!!
It's from the Food Rescue Alliance: https://www.boulderfoodrescue.org/food-rescue-alliance/
Here is their gitlab: https://gitlab.com/food-rescue-alliance/tomato
FRA is amazing and I fully recommend checking them out.
We decided to go with Food Rescue US (FRUS) for a variety of reasons, but we've also joined FRA. Their app is our backup if ever need be.