Apereo CAS - Identity & Single Sign On for all earthlings and beyond.
Flexible and versatile OAuth 2.0/OpenID Connect stack for .NET
Easy to use OpenID Connect client and server library written for Go and certified by the OpenID Foundation
An ASP.NET Core Web App which lets sign-in users (including in your org, many orgs, orgs + personal accounts, sovereign clouds) and call Web APIs (including Microsoft Graph)
npm package for OpenID Connect, OAuth Code Flow with PKCE, Refresh tokens, Implicit Flow
OpenID Certified™ OpenID Connect and FAPI 2 Relying Party module for Apache HTTPd
OpenID Connect Relying Party and OAuth 2.0 Resource Server implementation in Lua for NGINX / OpenResty
.NET samples for OpenIddict
OAuth2 / OIDC for Spring backends of SPAs and mobile apps: the Spring Security beans the official starters leave to you (authorities, CORS, 2xx/401 for fetch, CSRF cookie, validated redirects, logout, one refresh flow at a time), as properties.
Portier Broker reference implementation, written in Rust