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Feature complete
To cover most scenarios, OpenIddict offers a server stack, a client stack and a validation stack that you can use independently... or together.
OpenIddict
Versatile OAuth 2.0/OpenID Connect stack for .NET
Free and open source ❤
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Usuable in most .NET applications
The server and validation stacks can be used in any ASP.NET Core 2.1+ or ASP.NET 4.6.1+ application while the client stack can also be used in Windows, macOS or Linux desktop applications (and even Android or iOS apps!)
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Released under a permissive license
OpenIddict is released under the Apache 2.0 license, which means it's open source and free to use, even in commercial projects.