An easy one I would do myself if I had more time. A calorie tracker that does not try to get you into a cult.

• The only time it accesses the internet is to update its on-board database.
• None of your data gets sent anywhere unless you choose to share it (for things like new foods).
• No suggestions.
• No exercise programs or tracking
• No sleep tracking.
• Tracks only what you want. Extras available through add-ons or something, but I don't care about tracking nutrients, fat, carbs, etc. so keep them out of my way.
• In short, follow the Unix guideline of an app doing one thing and doing it well.