OAuth.io vs sso: What are the differences?

OAuth.io: OAuth That Just Works. OAuth is a protocol that aimed to provide a single secure recipe to manage authorizations. It is now used by almost every web application. However, 30+ different implementations coexist. OAuth.io fixes this massive problem by acting as a universal adapter, thanks to a robust API. With OAuth.io integrating OAuth takes minutes instead of hours or days; sso: Buzzfeed's single-sign-on authentication proxy. The authentication and authorization system BuzzFeed developed to provide a secure, single sign-on experience for access to the many internal web apps used by our employees.

OAuth.io and sso can be categorized as "User Management and Authentication" tools.

sso is an open source tool with 2.11K GitHub stars and 109 GitHub forks. Here's a link to sso's open source repository on GitHub.