Guardian vs Stormpath: What are the differences?
What is Guardian? Remove the OAuth dance with one request. Avoid dealing with OAuth logic in your code, and spend more time creating your product. Guardian reduces the OAuth footprint in your code to a single request. Built with modularity in mind, Guardian leverages plugins to handle OAuth flows, should you encounter a flow that Guardian doesn't handle, create a small flow plugin to do so and carry on. Guardian comes with 5 pre-made plugins that cover 99% of OAuth services.
What is Stormpath? User Management and Authentication for Developers. Stormpath is an authentication and user management service that helps development teams quickly and securely build web and mobile applications and services.
Guardian and Stormpath can be categorized as "User Management and Authentication" tools.
Guardian is an open source tool with 628 GitHub stars and 42 GitHub forks. Here's a link to Guardian's open source repository on GitHub.