Humanizer meets all your .NET needs for manipulating and displaying strings, enums, dates, times, timespans, numbers and quantities. It is licensed under the MIT (an OSI approved license).

FluentValidation is a popular .NET library for creating strongly-typed validation rules for objects using a fluent interface.

FlubuCore - Fluent Builder Core" is a cross platform build and deployment automation system.

Finbuckle.MultiTenant is open source multitenancy middleware for .NET.

FIDO2 .NET Library enables passwordless sign in for the .net ecosystem. It's a developer friendly and well tested .NET FIDO2 Server / WebAuthn relying party library for attestation and assertion of FIDO2 / WebAuthn credentials, in order to increase the adoption of the technology, ultimately defeating phishing attacks.

Esquio is a Feature Toggles (aka Feature Flags) and A/B testing framework for .NET Core.

Entity Framework is the recommend data access technology for new applications in .NET.

Elsa Workflows is a set of workflows libraries that enable workflow execution in any .NET Standard application. Workflows can be defined using C# code or using JSON. A workflow designer is provided in the form of an HTML5 web component.

DotVVM lets you build interactive web UIs with just C# and HTML using the MVVM approach.

Docker.DotNet allows you to interact with Docker Remote API endpoints in your .NET applications.

DNN® ( formerly DotNetNuke® ) is the leading open-source web content management platform (CMS) in the Microsoft ecosystem.

DLR is a framework for implementing dynamic languages on top of the .NET Framework.

This package contains useful extensions for the WPF DataGrid (System.Windows.Controls.DataGrid).

Coverlet is a cross platform code coverage framework for .NET, with support for line, branch and method coverage. It works with .NET Framework on Windows and .NET Core on all supported platforms.

CoreWF is a port of the Windows Workflow Foundation (WF) runtime to .NET Core and .NET Standard.

CoreWCF is a port of Windows Communication Framework (WCF) to .NET Core. The goal of this project is to enable existing WCF projects to move to .NET Core.

ClangSharp provides Clang bindings written in C#. It is self-hosted and auto-generates itself by parsing the Clang C header files using ClangSharpPInvokeGenerator.

Chem4Word enables you to create chemical structures directly in Microsoft Word. Not only can you draw your own structures, but you can import structures from PubChem and Opsin as well as from your own files. With the latest version, inside the editor form, you can export or import your structures as CML or MDL Molfile format. This will allow you to copy your edited structures to other documents or share them with other users or applications.

Cecil is a library to generate and inspect programs and libraries in the ECMA CIL form.

Cake is a cross platform build automation system, built on top of Roslyn and the Mono Compiler, which uses C# as the scripting language.