Open Source C# Single Sign On (SSO) Software

IdentityServer is a free, open-source OpenID Connect and OAuth 2.0 framework for ASP.NET Core. Founded and maintained by Dominick Baier and Brock Allen, IdentityServer4 incorporates all the protocol implementations and extensibility points needed to integrate token-based authentication, single-sign-on and API access control in your applications. IdentityServer4 is officially certified by the OpenID Foundation and thus spec-compliant and interoperable. It is part of the .NET Foundation and operates under their code of conduct. It is licensed under Apache 2 (an OSI-approved license). Active development happens on the main branch. This always contains the latest version. Each (pre-) release is tagged with the corresponding version. The aspnetcore1 and aspnetcore2 branches contain the latest versions of the older ASP.NET Core based versions.

Small C# web-application for single-sign-in based on B2XCore. Support of multiple security-provider.

Direct Access Framework (DAF) provides a simple lightweight solution for Single SignOn and Licensing starting from a portal or LMS/ VLE. It has been deleveoped for the Dutch educational industry to enable pupils easely access content from various pub

Lightweight Authentication Module (LAM) is a language-neutral API allowing single-sign-on to be easily implemented across diverse applications. Provides authentication via CAS or other engines, and manages sessions. Client bindings in C#, Perl, or Java.

This is a squid external authentication helper to facilitate SSO, single sign on, with Novell's eDirectory. It's written in mono and uses LDAP to access the information stored in eDirectory.