AWS Amplify - JavaScript library for app development using cloud services
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
Parse - Build applications faster with object and file storage, user authentication, push notifications, dashboard and more out of the box.
SmallDevTools - Handy developer tools with a delightful interface
AnyPresence - AnyPresence is an Enterprise Backend as a Service for mobile app development and API augmentation.
GitHub Student Developer Pack - The best developer tools, free for students.