I recommend Waistline if you use Android. It's on F-Droid.

The barcode scanner uses a community run database (Open Food Facts) for nutrition facts so you might find that you need to manually input items or correct outdated info more often than compared to the more popular My Fitness Pal. Obviously that gets easier once you build up a collection of your usual foods in the app.

Waistline, which uses Open Food Facts for the nutrional information of products.

I'm using 'food tracker' to track calories. it's available on F-Droid. hope it will be sufficient as replacement