Prisma - Art filters using artificial intelligence to transform your photos into classic artwork.
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
Hasura - Hasura is an open platform to build scalable app backends, offering a built-in database, search, user-management and more.
restdb.io - restdb.io lets you create databases and REST APIs quickly. Development databases are free. Powerful web-based and mobile-friendly data management.
RemoteStorage - An open protocol for per-user storage OWN YOUR DATA
How to GraphQL - Open-source tutorial website to learn GraphQL development