EFCore.BulkExtensions.SqlServer by: borisdj

EntityFramework EF Core Bulk Batch Extensions for Insert Update Delete Read (CRUD) operations on SQL Server

Elasticsearch.Net by: Elasticsearch Inc. and contributors

Exposes all the api endpoints but leaves you in control of building the request and response bodies. Comes with built in cluster failover/connection pooling support.

EmptyFiles by: https://github.com/VerifyTests/EmptyFiles/graphs/contributors

A collection of minimal binary files.

EntityFramework by: Microsoft

Entity Framework 6 (EF6) is a tried and tested object-relational mapper for .NET with many years of feature development and stabilization.

EPPlus by: Jan Källman

A library to manage Excel spreadsheets, using OOXML.

ExcelDataReader by: iciobanu

Lightweight and fast library written in C# for reading Microsoft Excel files ('97-2007).

ExcelNumberFormat by: ExcelNumberFormat developers

.NET library to parse ECMA-376 number format strings and format values like Excel and other spreadsheet softwares.

Extended.Wpf.Toolkit by: Xceed

Extended WPF Toolkit is the number one collection of WPF controls, components and utilities for creating next generation Windows applications. Provides 48 controls, all offered under the Xceed Software Inc Community License. v4.7 provides 19 bug fixes and improvements. Documentation, source, and discussions are hosted on Github at https://github.com/xceedsoftware/wpftoolkit. Check out the Plus Edition to support the project, get more controls and features, and work with a version a few releases ahead of the free releases.

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: Atif Aziz Colin Ramsay

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

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.

FluentValidation by: Jeremy Skinner

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

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.