For several years my son and I have looked at the moon most evenings that it's visible. This discussion of the lunar calendar has me intrigued as to what it might be like to tune in more closely to the lunar cycles as another way of being in nature. To that end, I found an app! Oh, the irony....
At any rate, Daff Moon gets my vote as an excellent tool. I've been using it for a few weeks now; my favorite features are a chart showing the phases of the moon, and a "sphere" feature that shows the sun and the moon in a simple 3D view in relation to the ground plane at my location. It has lots more: the sun, the planets, orbits, if those are of interest. Two thumbs up!