Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
Proof.ink - Proven immutable data stored on the Steem blockchain
jsonbox.io - A free HTTP based JSON Storage.
Quick Freeze - Move faster by skipping the setup and management of local databases and direct integrations.
Refi App - An open-source GUI tool to make interacting with Firestore less painful
Immutable.js - Immutable persistent data collections for Javascript which increase efficiency and simplicity. - immutable-js/immutable-js