Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
Dokku - Docker powered mini-Heroku in around 100 lines of Bash
Spring Security - The Spring portfolio has many projects, including Spring Framework, Spring IO Platform, Spring Cloud, Spring Boot, Spring Data, Spring Security...
Google Cloud Functions - A serverless platform for building event-based microservices.
Firebase Authentication - Application and Data, Application Utilities, and User Management and Authentication