Facebook by: Jim Zimmerman Nathan Totten Prabir Shrestha

The Facebook C# SDK core.

FakeItEasy by: Patrik Hägne FakeItEasy contributors

It's faking amazing! The easy mocking library for .NET that works great in C# and VB.NET alike. No need to know the difference between a stub, a mock or a spy, everything's a fake! The easy to use, refactoring friendly API makes faking a breeze.

Faker.Net by: Ben Smith Ollie Riches Robin Michael

C# port of the Ruby Faker gem (http://faker.rubyforge.org/) and is used to easily generate fake data: names, addresses, phone numbers, etc.

Fare by: Nikos Baxevanis

.NET port of dk.brics.automaton - Project Fare is an effort to bring a DFA/NFA (finite-state automata) implementation from Java to .NET. There are quite a few implementations available in other languages today. This project aims to fill the gap in .NET.

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.

FastMember.Signed 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.

FFMpegCore by: Malte Rosenbjerg Vlad Jerca Max Bagryantsev

A .NET Standard FFMpeg/FFProbe wrapper for easily integrating media analysis and conversion into your .NET applications

FirebaseAdmin by: Google Inc.

Firebase Admin SDK enables server-side .NET developers to integrate Firebase into their services and applications.

FluentAssertions by: Dennis Doomen Jonas Nyrup

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 and MSpec. Supported by InfoSupport B.V.

FluentMigrator by: Sean Chambers Josh Coffman Tom Marien Mark Junker John Zabroski

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.

FluentMigrator.Tools by: Josh Coffman Tom Marien Mark Junker

!!!OBSOLETE!!! Please use FluentMigrator.Console instead

FluentValidation by: Jeremy Skinner

A validation library for .NET that uses a fluent interface to construct strongly-typed validation rules.

FluentValidation.AspNetCore by: Jeremy Skinner

AspNetCore integration for FluentValidation

FluentValidation.DependencyInjectionExtensions by: Jeremy Skinner

Dependency injection extensions for FluentValidation

Fluid.Core by: Sebastien Ros

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

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.

FSharp.Control.Reactive by: Ryan Riley Steffen Forkmann Jared Hester

A F#-friendly wrapper for the Reactive Extensions.

FSharp.Core by: Microsoft

FSharp.Core redistributables from F# Tools version 12.9.100 For F# 9.0. Contains code from the F# Software Foundation.

FSharp.Json.New by: vsapronov Anton Moldovan

F# JSON Reflection based serialization library

FsToolkit.ErrorHandling by: demystifyfp TheAngryByrd

FsToolkit.ErrorHandling is an extensive utility library based around the F# Result type, enabling consistent and powerful error handling.