Extended.Wpf.Toolkit by: Xceed

Extended WPF Toolkit is the number one collection of WPF controls, components and utilities for creating next generation Windows applications. Provides 48 controls, all offered under the Xceed Software Inc Community License. v5.1 provides 12 bug fixes and improvements. Documentation, source, and discussions are hosted on Github at https://github.com/xceedsoftware/wpftoolkit. Check out the Plus Edition to support the project, get more controls and features, and work with a version a few releases ahead of the free releases.

FastMember by: Marc Gravell

In .NET reflection is slow... well, kinda slow. If you need access to the members of an arbitrary type, with the type and member-names known only at runtime - then it is frankly hard (especially for DLR types). This library makes such access easy and fast.

Fizzler by: colinramsay1980, azizatif

A .NET library to select items from a node tree based on a CSS selector. The default implementation is based on HTMLAgilityPack and selects from HTML documents. There over 140 unit tests - see below for more information. The tests are based on the jQuery selector engine tests. At this time, the library is BETA quality.

FlaUI.UIA3 by: Roemer

Library to use FlaUI with UIA3.

FluentAssertions by: Dennis Doomen, Jonas Nyrup, Xceed

A very extensive set of extension methods that allow you to more naturally specify the expected outcome of a TDD or BDD-style unit tests. Works with .NET Standard 2.0 and higher, .NET Framework 4.7 and higher and .NET 6 and higher. Supports the unit test frameworks MSTest2, NUnit3, NUnit4, XUnit2, XUnit3, MSpec and TUnit. IMPORTANT: This version is free for open-source projects and non-commercial use, but commercial use requires [a paid license](https://xceed.com/products/unit-testing/fluent-assertions/). Check out the [license page](LICENSE) for more information.

Fluid.Core by: Sebastien Ros

Fluid is a template engine based on the Liquid markup, with focus on performance and .NET programming patterns.

Fody by: The Fody Team

Extensible tool for weaving .net assemblies.

FodyHelpers by: The Fody Team

Helpers for Fody.

FodyPackaging by: The Fody Team

NuGet packaging Fody repositories

Gee.External.Capstone by: Ahmed Garhy (@9ee1)

Capstone.NET is an opinionated .NET Core and a .NET Framework binding for the Capstone disassembly framework. It is written in C#, supports Capstone 4, and has a friendly and simple type safe API that is ridiculously easy to learn and quick to pick up.

Google.OrTools by: Laurent Perron

.NET wrapper for the Operations Research Tools project

Google.OrTools.runtime.linux-arm64 by: Laurent Perron

.NET native wrapper for the Operations Research Tools project

Google.OrTools.runtime.linux-x64 by: Laurent Perron

.NET native wrapper for the Operations Research Tools project

Google.OrTools.runtime.osx-arm64 by: Laurent Perron

.NET native wrapper for the Operations Research Tools project

Google.OrTools.runtime.osx-x64 by: Laurent Perron

.NET native wrapper for the Operations Research Tools project

Google.OrTools.runtime.win-x64 by: Laurent Perron

.NET native wrapper for the Operations Research Tools project

Google.Protobuf by: Google Inc.

C# runtime library for Protocol Buffers - Google's data interchange format.

HtmlAgilityPack by: Simon Mourrier, Jeff Klawiter

This is an agile HTML parser that builds a read/write DOM and supports plain XPATH or XSLT (you actually don't HAVE to understand XPATH nor XSLT to use it, don't worry...). It is a .NET code library that allows you to parse "out of the web" HTML files. The parser is very tolerant with "real world" malformed HTML. The object model is very similar to what proposes System.Xml, but for HTML documents (or streams).

Humanizer by: Claire Novotny, Mehdi Khalili

Humanizer meets all your .NET needs for manipulating and displaying strings, enums, dates, times, timespans, numbers and quantities

Hyak.Common by: Microsoft

Provides infrastructure for common error handling, tracing, configuration, and HTTP/REST-based pipeline manipulation for REST clients generated with Hyak.