FastExpressionCompiler by: Maksim Volkau

FastExpressionCompiler is 10-40x times faster than Expression.Compile()

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: Atif Aziz Colin Ramsay

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

FluentValidation by: Jeremy Skinner

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

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.

Fortress.Facilities.Logging by: @fir3pho3nixx @hikalkan

Unofficial Castle Windsor on dotnet core

Fortress.Windsor by: @fir3pho3nixx @hikalkan

Unofficial Castle Windsor on dotnet core

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.

Google.Protobuf by: Google Inc.

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

HangFire by: Sergey Odinokov

Incredibly easy and reliable way to perform fire-and-forget, delayed and recurring long-running, short-running, CPU or I/O intensive tasks inside ASP.NET application. No Windows Service / Task Scheduler required. Even ASP.NET is not required. Backed by Redis, SQL Server, SQL Azure or MSMQ. http://hangfire.io/

Hangfire by: Sergey Odinokov

An easy and reliable way to perform fire-and-forget, delayed and recurring, long-running, short-running, CPU or I/O intensive tasks inside ASP.NET applications. No Windows Service / Task Scheduler required. Even ASP.NET is not required. Backed by Redis, SQL Server, SQL Azure or MSMQ. This is a .NET alternative to Sidekiq, Resque and Celery. https://www.hangfire.io/

Hangfire.AspNetCore by: Sergey Odinokov

ASP.NET Core support for Hangfire, a background job framework for .NET applications.

Hangfire.Console by: Alexey Skalozub

Job console for Hangfire

Hangfire.Core by: Sergey Odinokov

An easy and reliable way to perform fire-and-forget, delayed and recurring, long-running, short-running, CPU or I/O intensive tasks in .NET applications. No Windows Service / Task Scheduler required. Backed by Redis, SQL Server, SQL Azure or MSMQ. This is a .NET alternative to Sidekiq, Resque and Celery. https://www.hangfire.io/

Hangfire.MySqlStorage by: Arnoldas Gudas

Hangfire MySql Storage

Hangfire.NetCore by: Sergey Odinokov

.NET Core's Worker Service host support for Hangfire, a background job framework for .NET applications.

Hangfire.RecurringJobExtensions by: icsharp

Hangfire extensions for RecurringJob

HangFire.SqlServer by: Sergey Odinokov

SQL Server / SQL Azure job storage implementation for HangFire (background job system for ASP.NET applications).

Hangfire.SqlServer by: Sergey Odinokov

SQL Server 2008+ (including Express), SQL Server LocalDB and SQL Azure storage support for Hangfire, a background job framework for .NET applications.

Haukcode.DinkToPdf by: rdvojmoc HakanL

.NET Core P/Invoke wrapper for wkhtmltopdf library that uses Webkit engine to convert HTML pages to PDF.

Haukcode.WkHtmlToPdfDotNet by: rdvojmoc HakanL georgechond94

.NET Core P/Invoke wrapper for wkhtmltopdf library that uses Webkit engine to convert HTML pages to PDF.