FusionAuth is an identity and access management solution designed to make user authentication and authorization easier for developers. It is a comprehensive identity platform that enables developers to quickly and securely authenticate users and control access to web, mobile, and API services. FusionAuth provides a full suite of authentication features, including multi-factor authentication, passwordless login, single sign-on, and OAuth support. It also offers a powerful user management system, allowing developers to manage users, groups, and permissions. Additionally, FusionAuth supports custom branding, auditing, and reporting, and provides powerful integrations with popular authentication protocols and third-party services. By combining identity management, authentication, and access control, FusionAuth allows developers to quickly and securely manage user access to their applications and APIs.
Discontinued from http://stormpath.com/"Stormpath has joined forces with Okta. The Stormpath API will be shut down on 8/17/2017 at noon PST." Joined http://alternativeapp.info/software/okta/