Here are a few links that I just found:
PhoneGap / Cordova:
Universal Windows Platform:
The Windows SDK, Microsoft Advertising SDK, Microsoft Store Services SDK, and the Microsoft Store provide many features that enable you to make more money from your apps and gain customers from engaging with your users.
Xsoloa ( agar.io uses this)
Xsolla Documentation - Store
I’m a newbie with all this, so I would love someone else to chime in who has some real experience.