5play.ru - 5play.ru enables you to download highly-rated Apps and Games for Android devices.
API List - A collective list of APIs. Build something.
Altstore - A home for apps that push the boundaries on iOS
Phantombuster - A marketplace of simple to use no-code APIs
iOSGODS! - iOSGODS!
The Unsplash API - No-limits, do-what-you-want API for access to 200K+ HD pics.