There's also an app on the Play/App stores (so not open source), which is better in that it does scoring (better than the nutriscore) based on the OpenFoodFacts

There's also an app on the Play/App stores (so not open source), which is better in that it does scoring (better than the nutriscore) based on the OpenFoodFacts data, proposes better alternatives, and also handles cosmetics, called Yuka.