In addition there are some good iPhone and iPad apps (don't know Android or other smart phones or tablets) which I use regularly. There's Sun Seeker and Moon Seeker which are companions apps to display sun and moon information separately.
LightTrac is a good one for showing direction of the sun and moon at locations, either where you're at or other places stored in the list of places along with some information. A good app for the moon I found recently is Moon Calendar.
And lastly there is the complete suite of tools and function with The Photographer's Ephemeris (TPE) which to me has become a lot in a small package, too much for the smaller iPhones (mine's a 5s), but works better with an iPad (mine's and iPad Air but a iPad mini would work).
There's the Web version of TPE which I stopped using. I found it too much and cumbersome for a Web application over the iPad version,
and still am slightly upset he dropped the stand-alone Adobe Air version when he didn't have to by embedding a sunset date into the app. Cheap shot.
Another app is Helios which is also good with lots of tools and functions, but is made for the iPhone, not any of the iPads. That's what I keep on my iPhone and iPad. There are lots of them in the iTunes app store.