FakeItEasy by: Patrik Hägne

It's faking amazing! The easy mocking framework for .Net that works great in C# and VB.Net alike. No need to know the difference between a stub and a mock, everythings a fake! The easy to use, refactoring friendly api makes faking a breeze.

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.

Firebird.v2-5-x.Embedded by: rene hankel

necessary firebird embedded dll's for .NET applications from firebird release v2.5.6.27020 (x86 and x64 depending by project settings) ATTENTION - not working with clickonce applikations(the files will be not part of the clickonce paket :/)

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.

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.

FluentMigrator by: Josh Coffman Tom Marien

FluentMigrator is a database migration framework for .NET written in C#. The basic idea is that you can create migrations which are simply classes that derive from the Migration base class and have a Migration attribute with a unique version number attached to them. Upon executing FluentMigrator, you tell it which version to migrate to and it will run all necessary migrations in order to bring your database up to that version. In addition to forward migration support, FluentMigrator also supports different ways to execute the migrations along with selective migrations called profiles and executing arbitrary SQL.

FluentNHibernate by: James Gregory and contributors

Fluent, XML-less, compile safe, automated, convention-based mappings for NHibernate.

Fluxor.Blazor.Web by: Peter Morris

A zero boilerplate Redux/Flux framework for Blazor

Fody by: Fody

Extensible tool for weaving .net assemblies.

FodyHelpers by: FodyHelpers

Helpers for Fody.

FormCMS by: Jason Chen

A headless CMS with GraphQL API and drag-and-drop page designer.

Fractions by: Daniel Mueller

The fraction data type consists of two BigInteger values for numerator and denominator. It implements various operations (addition, subtraction, multiplication, division and remainder) with operator overloads.

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.

GeoAPI by: NetTopologySuite Team

GeoAPI.NET project provides a common framework based on OGC/ISO standards to improve interoperability among .NET GIS projects.

gherkin by: aslakhellesoy

A fast lexer and parser for the Gherkin language based on Ragel

Glob.cs by: Michael Ganss

File system path globbing

Google.Protobuf by: Google Inc.

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

GraphQL by: Joseph T. McBride

GraphQL for .NET

GraphQL-Parser by: Marek Magdziak

Library containing lexer and parser for GraphQL syntax

GraphQL.Analyzers by: Joe McBride

GraphQL.Analyzers