There is a gaming cloud backend at http://www.clanofthecloud.com/
I have been told that they will be making a completely free tier price plan very soon.
I have been messing with the API and it's cross platform and works really well.
It allows you to have multiple cross platform leaderboards, achievements, and lots more, etc...
Here is my test code so far to get people started:http://www.sinistersoft.com/downloads/clan.lua
Just add it to your project then exclude it from execution, then include it in your code like this:
Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).https://deluxepixel.com