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Open-source .NET web frameworks

7 .NET web frameworks whose code is public under an OSI-approved license, rated for privacy with evidence. Picks first, then by score.

  1. Carter Grade B

    Library for ASP.NET Core that organizes minimal API routes into modules, with support for validation and content negotiation.

    MIT-licensed. Source code

  2. Orchard Core Grade C

    Modular application framework and content management system built on ASP.NET Core, with multi-tenancy and a headless CMS mode.

    BSD 3-Clause-licensed. Source code

  3. ASP.NET Core Grade D

    Microsoft framework for building web apps, APIs and real-time services in C# on .NET, with MVC, Razor Pages, minimal APIs and SignalR.

    MIT-licensed. Source code

  4. Blazor Grade D

    Microsoft framework for building interactive web user interfaces in C# with Razor components, running on the server or in the browser through WebAssembly.

    MIT-licensed as part of ASP.NET Core. Source code

  5. FastEndpoints Grade D

    Library for building REST APIs on ASP.NET Core in which each endpoint is a class with its own request and response types (the REPR pattern).

    MIT-licensed. Source code

  6. ServiceStack Grade D

    Framework for building message-based web services and APIs on .NET, with typed clients, an ORM and generated admin interfaces. Dual-licensed under the AGPL and a commercial license.

    AGPL-3.0-licensed with a FOSS exception, and a paid commercial license for closed-source use. Source code

  7. ABP Framework Grade D

    Application framework for ASP.NET Core from Volosoft, with a modular architecture, domain-driven design building blocks, multi-tenancy and startup templates.

    The framework is LGPL-3.0-licensed; commercial modules and ABP Studio are sold separately. Source code

Compare all 7 .NET web frameworks, open source or not.