Best IdentityServer Alternatives & Competitors in 2025

Open Source Identity and Access Management for modern Applications and Services.

Open Source

ASP.NET Identity is a membership-based software system designed for the authentication and authorization of the users via building an ASP.NET application.

DCIM software reinvented.

Try for free paid Free Trial $600.0 / Annually (300 Assets)

Auth0 is a program for people to get authentication and authorization services for their own business use.

Open Source

DotNetOpenAuth is a free-to-use compiled library that comes with the real support to your site visitor to login with the help of openIDs via getting control of the ASP.NET control onto the page.

OAuth is an open standard for authorization. It allows users to share their private resources (e.g.

Okta Workforce Identity is utility software for enterprises that provides a new way of work that enable your employees, contractors, and partners to use technology on any device.

ASP.NET SAML is an open-source authentication utility that has been used for exchanging authentication and authorization data between the channels.

Authelia is an open-source authentication server providing SSO and two-factor for your applications running behind NGINX.

Open Source

BugMeNot is a free Internet service that provides usernames and passwords to allow users to bypass the registration process for websites.

OpenIddict aims at providing a versatile solution to implement an OpenID Connect server and token validation in any ASP.NET Core

On-demand SSO, directory integration, user provisioning and more

PwdLess is an open-source and reliable authentication server that legitimizes you to register or login users without the need for a password.

Developer-first Access Management

Open Source