Fluid.Core by: Sebastien Ros

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

FluentValidation by: Jeremy Skinner

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

FluentFTP by: Robin Rodricks FluentFTP Contributors

An FTP and FTPS client for .NET & .NET Standard, optimized for speed. Provides extensive FTP commands, File uploads/downloads, SSL/TLS connections, Directory listing parsing, File hashing/checksums, File permissions/CHMOD, FTP proxies, FXP transfers, UTF-8 support, Async/await support, Powershell support and more. Written entirely in C#, with no external dependencies.

FluentValidation.AspNetCore by: Jeremy Skinner

AspNetCore integration for FluentValidation

Fody by: The Fody Team

Extensible tool for weaving .net assemblies.

FontStashSharp.Rasterizers.SixLabors.Fonts by: FontStashSharpTeam

Package Description

FFmpeg.AutoGen by: Ruslan Balanukhin

FFmpeg auto generated unsafe bindings for C#/.NET and Mono.

FluentStorage by: Robin Rodricks Ivan Gavryliuk FluentStorage Contributors

FluentStorage, originally known as Storage.NET, is a polycloud .NET cloud storage library to interface with multiple cloud providers from a single unified interface. Provides Blob storage (AWS S3, GCP, FTP, SFTP, Azure Blob/File/Event Hub/Data Lake) and Messaging (AWS SQS, Azure Queue/ServiceBus). Supports .NET 5+ and .NET Standard 2.0+. Pure C#. MIT license. Commercial use allowed.

Fleck by: statenjason

C# WebSocket Implementation

FontStashSharp.Base by: FontStashSharpTeam

Package Description

Flurl.Http by: Todd Menier

A fluent, testable HTTP client library.

Flurl by: Todd Menier

A fluent, portable URL builder. To make HTTP calls off the fluent chain, check out Flurl.Http.

FluentValidation.DependencyInjectionExtensions by: Jeremy Skinner

Dependency injection extensions for FluentValidation

FluentNHibernate by: James Gregory and contributors (Paul Batum Hudson Akridge Gleb Chermennov Jorge Rodríguez Galán).

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

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.

FluentEmail.Smtp by: Luke Lowrey Ben Cull Github Contributors

Now we're talking. Send emails via SMTP.

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, MSTest3, MSTest4, 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.

FluentEmail.Core by: Luke Lowrey Ben Cull Github Contributors

Send emails very easily. Use razor templates, smtp, embedded files, all without hassle. This is a Base Package and includes just the domain model, very basic defaults, and is also included with every other Fluent Email package here.

FreeIM by: YeXiangQin

.NET websocket 实现简易、高性能、集群即时通讯组件，支持点对点通讯、群聊通讯、上线下线事件消息等众多实用性功能.

FirebirdSql.Data.FirebirdClient by: FirebirdSQL

Firebird ADO.NET data provider