I have far too many on my phone.
Here is a list (that I haven't updated is a few months). My favorites are Pandora, WRVO (My local Public Radio station), The Photographer's Ephemeris (An app that gives the time & direction of sun & moon rise & set for any date, & place), iBird + (Bird guide that includes audio files), Camp & RV and CampWhere for finding campgrounds, and Campground Reviews for evaluating them, Accuweather, Candy Crush (an addicting game) and CardStar (lets you photo your plastic store cards rather than carrying them - Most cash registers will read them from your phone.)