Back-end/API tools Data/back-end as a service aka BAAS: Back& [free to $] Firebase [free to $] Kinvey [free'ish to $] Pusher [free to $] restdb.io [free to $] Data/back-end Horizon GraphQL http://www.apollodata.com/ Relay Falcor RxDB User Management as a Service: Auth0 [$] AuthRocket Stormpath UserApp [free to $]