Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
How to GraphQL - Open-source tutorial website to learn GraphQL development
jsonbox.io - A free HTTP based JSON Storage.
GraphQL Playground - GraphQL IDE for better development workflows
Refi App - An open-source GUI tool to make interacting with Firestore less painful
Hasura - Hasura is an open platform to build scalable app backends, offering a built-in database, search, user-management and more.