Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
Parse - Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.
Supabase - An open source Firebase alternative
AWS Amplify - JavaScript library for app development using cloud services
Etebase - Etebase makes it easy to build end-to-end encrypted applications by taking care of the encryption and its related challenges.
AWS Mobile Services - Storage, Analytics, Push Notif. & SMS Delivery SDKs