Foundatio by: FoundatioFx

Pluggable foundation blocks for building distributed apps.

Flurl by: Todd Menier

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

FluentValidation by: Jeremy Skinner

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

Foundatio.Kafka by: FoundatioFx

Pluggable foundation blocks for building distributed apps.

Flurl.Http by: Todd Menier

A fluent, testable HTTP client library.

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.

FirebirdSql.Data.FirebirdClient by: FirebirdSQL

Firebird ADO.NET data provider

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.

Fluid.Core by: Sebastien Ros

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

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.

FluentValidation.DependencyInjectionExtensions by: Jeremy Skinner

Dependency injection extensions for FluentValidation

FluentEmail.Smtp by: Luke Lowrey Ben Cull Github Contributors

Now we're talking. Send emails via SMTP.

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.

FluentValidation.AspNetCore by: Jeremy Skinner

AspNetCore integration for FluentValidation

FluentStorage by: Robin Rodricks FluentStorage Contributors

A polycloud .NET cloud storage abstraction layer. Provides a single unified polycloud API across 15+ clouds for Object manipulation, File uploads/downloads, File streaming/seeking, Object metadata, Versioning, Tags, Storage tier/class, Presigned URLs, Directory manipulation and more.

Fody by: The Fody Team

Extensible tool for weaving .net assemblies.

FreeSpire.Doc by: Administrator

Free Spire.Doc for .NET is a professional and reliable word component for commercial and personal use. It enables developers to quickly and easily generate, read, write, save, print and convert documents on any .NET applications (ASP.NET, WinForms and Web Service, .NET Core) and it supports in C#, VB.NET. The featured function, conversion allows converting Word documents (Word 97-2003, Word 2007, Word 2010, Word 2013) to commonly used file format, format, such as XML, RTF, TXT, PDF, XPS, EPUB, HTML and Image etc. Free Spire.Doc for.NET is 100% FREE word component. Free Spire.Doc for .NET Features: *No Microsoft Word Automation *Speed and Easy-to-Use *Batch of Great Functions *High Performance *Totally Free Main functions High quality conversion Rich Word Document Features Process Pre-Existing Word Documents Other Technical Features

FodyHelpers by: The Fody Team

Helpers for Fody.

FluentValidation.ValidatorAttribute by: Jeremy Skinner

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

Fizzler by: Atif Aziz Colin Ramsay

Fizzler is a W3C Selectors parser and generic selector framework for document hierarchies.