DotNetAnalyzers.PublicApiAnalyzer.Unstable by: Sam Harwell et. al.

An analyzer for packages with public APIs.

DotNetCore.CAP by: savorboard dotnetcore

EventBus and eventually consistency in distributed architectures.

DotNetCore.NPOI by: NCC Savorboard

A .NET library for reading and writing Microsoft Office binary and OOXML file formats.

DynamicData by: Roland Pheasant

Bring the power of Rx to collections using Dynamic Data. Dynamic Data is a comprehensive caching and data manipulation solution which introduces domain centric observable collections. Linq extensions enable dynamic filtering, sorting, grouping, transforms, binding, pagination, data virtualisation, expiration, disposal management plus more.

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

A collection of minimal binary files.

Enums.NET by: Tyler Brinkley

Enums.NET is a high-performance type-safe .NET enum utility library

EnyimMemcachedCore by: cnblogs.com

EnyimMemcachedCore is a Memcached client library for .NET Core. Usage: Add services.AddEnyimMemcached(...) and app.UseEnyimMemcached() in Startup. Add IMemcachedClient into constructor.

EPPlus by: Jan Källman

A library to manage Excel spreadsheets, using OOXML.

ExCSS by: Tyler Brinks

ExCSS is a CSS 3 parser for .NET. ExCSS makes it easy to read and parse stylesheets into a friendly object model with full LINQ support.

ExtendedNumerics.BigDecimal by: https://github.com/AdamWhiteHat

Arbitrary precision decimal class

FirebirdSql.Data.FirebirdClient by: FirebirdSQL

Firebird ADO.NET data provider

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.

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.

FluentFTP.GnuTLS by: Michael Stiemke Robin Rodricks and FluentFTP Contributors

Adds support for TLS1.3 streams into FluentFTP using a .NET wrapper of GnuTLS.

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

Fody by: The Fody Team

Extensible tool for weaving .net assemblies.

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.

Gee.External.Capstone by: Ahmed Garhy (@9ee1)

Capstone.NET is an opinionated .NET Core and a .NET Framework binding for the Capstone disassembly framework. It is written in C#, supports Capstone 4, and has a friendly and simple type safe API that is ridiculously easy to learn and quick to pick up.