Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
MongoDB - MongoDB (from "humongous") is a scalable, high-performance NoSQL database.
Spring Security - The Spring portfolio has many projects, including Spring Framework, Spring IO Platform, Spring Cloud, Spring Boot, Spring Data, Spring Security...
ArangoDB - A distributed open-source database with a flexible data model for documents, graphs, and key-values.
Firebase Authentication - Application and Data, Application Utilities, and User Management and Authentication
OrientDB - OrientDB - The World's First Distributed Multi-Model NoSQL Database with a Graph Database Engine.