I know many of us here deal with the daily worry of whether our parents are taking their medications. There's that constant low-level anxiety. I built a free app called RemindMe to help with exactly this.
Simple interface, Medicine photos, Meal instructions, Multiple languages, Inventory tracking, Doctor visit tracking, Test tracking
What it costs:
Nothing. Every core feature is free. I built this to solve my own family's problem, and I'm sharing it because the problem is universal.