Backend-as-a-Services (BaaS)
Providers:
http://piggate.com/
http://www.baasbox.com/en/
https://backendless.com/
https://www.kinvey.com/
http://www.appcelerator.com/mobile-app-development-products/
https://authrocket.com/
https://www.gamesparks.com/games-back-end/
https://stamplay.com/
https://www.dreamfactory.com/
http://www.gamedonia.com/backend/pricing
References
http://nordicapis.com/why-you-should-build-apps-with-an-api-backend-baas/