This is a free software application I originally create using jQuery mobile, but I found it very limiting so over the past two weeks I’ve rebuilt with OnsenUI and added a ton of new features. Waistline is a calorie counter, nutrition tracker, and weight log. It integrates with the Open Food Facts database and includes a barcode scanner and recipe builder.
You can download it from F-Droid (although the latest, onsenui built version isn’t live there yet), github, or the play store.