GitHub – OrchardCMS/OrchardCore: Orchard Core is an open-source modular and extensible application framework built with ASP.NET Core, and a content management system (CMS) built on top of that application framework.

Orchard Core is an open-source modular and extensible application framework built with ASP.NET Core, and a content management system (CMS) built on top of that application framework. http://www.orchardproject.net/