I recently received a Android tablet. As I have no use for a smartphone, this is the first "smart device" I've owned. For those who care, it's an Acer Iconia A1-810-L416 (7.9-Inch screen, 16 GB) running Android 4.2.2. It's certainly not the latest or the greatest, but it seems nice to me -- especially since it was a gift.
I'm looking for recommendations for free apps useful for running/playing tabletop RPGs. In some cases, I've overwhelmed by choices, for example, there seem to be a huge number of die rolling apps. I never have the time nor the interest to try them all in the hope of finding the best, or even just the best for me. In other cases, I have no idea what is out there and vague searches on Google Play don't turn up much -- not even software I've seen mentioned around the net.
So, remembering that I'm mainly interested in old school D&D and retroclones, what Android apps should like look at -- and why? As I mentioned, I've definitely interested in a good, general purpose die roller app but please don't limit suggestions to die rollers. Thanks in advance.