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Top 7 C# OAuth Projects
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products
The most flexible and standards-compliant OpenID Connect and OAuth 2.x framework for ASP.NET Core
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ReSharper
ReSharper is now available in VS Code and Cursor. ReSharper brings a professional toolset for C# developers backed by over 20 years of experience, enterprise-grade security, SOC 2 compliance, and the trust of companies worldwide.
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TheIdServer
OpenID/Connect, OAuth2, WS-Federation and SAML 2.0 server based on Duende IdentityServer and ITFoxtec Identity SAML 2.0 with its admin UI
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Security.Identity
.NET DevPack Identity is a set of common implementations to help you implementing Identity, Jwt, claims validation and another facilities
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Oidc.Server
Flexible OpenID Connect and OAuth 2.0 server-side implementation for modern ASP.NET projects
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SecuringAppsWithOAuth2AndOIDC
Fully functional App that demonstrate the various flows in OpenId. It uses Duende's Identity Server as the IDP. You'll also see a React app which uses the Backend for Frontend (BFF) pattern to communicate with the API along with a a pure JavaScript client which again uses the BFF pattern to communicate with the API.
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Code Effects
Code Effects: AI-Ready .NET Business Rules Engine. Embed visual business rules in your .NET app with AI-assisted authoring, native VS debugging, blazing-fast compiled evaluation, and no SaaS dependency. FREE edition available.
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C# OAuth discussion
C# OAuth related posts
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An Illustrated Guide to OAuth
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Seeking people for collaboration on open source projects I started. Also open to ideas. Preferably long-term. I can help you learn and you can help me with other things, such as coding, UI and more. Beginner friendly. Safe environment.
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Netflix adds “extra home” fee, will block usage in other homes if you don’t pay
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Why is authentication such a sh*t show with .NET 6?
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Signal App Scam/Hacked?
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Duende moves to a new Fair Trade License, lifting all constraints on the Community Edition
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A note from our sponsor - ReSharper
www.jetbrains.com | 7 Sep 2026
Index
What are some of the best open-source OAuth projects in C#? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | products | 1,614 |
| 2 | FluentHub | 1,246 |
| 3 | TheIdServer | 757 |
| 4 | Security.Identity | 576 |
| 5 | Oidc.Server | 110 |
| 6 | authentication-unity | 75 |
| 7 | SecuringAppsWithOAuth2AndOIDC | 1 |
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ReSharper is now available in VS Code and Cursor
ReSharper brings a professional toolset for C# developers backed by over 20 years of experience, enterprise-grade security, SOC 2 compliance, and the trust of companies worldwide.
www.jetbrains.com