CommandLineParser by: gsscoder, nemec, ericnewton76, moh-hassan

Terse syntax C# command line parser for .NET. For FSharp support see CommandLineParser.FSharp. The Command Line Parser Library offers to CLR applications a clean and concise API for manipulating command line arguments and related tasks.

ConsoleAppFramework by: Cysharp

Zero Dependency, Zero Overhead, Zero Reflection, Zero Allocation, AOT Safe CLI Framework powered by C# Source Generator.

CsQuery by: James Treworgy

CsQuery is an HTML parser, CSS selector engine and jQuery port for .NET 4 and C#. It implements all CSS2 and CSS3 selectors, all the DOM manipulation methods of jQuery, and some of the utility methods.

CsvHelper by: Josh Close

A library for reading and writing CSV files. Extremely fast, flexible, and easy to use. Supports reading and writing of custom class objects.

Cucumber.Messages by: Cucumber Ltd, TechTalk

Protocol Buffer messages for Cucumber's and SpecFlow's inter-process communication

Dapper by: Sam Saffron, Marc Gravell, Nick Craver

A high performance Micro-ORM supporting SQL Server, MySQL, Sqlite, SqlCE, Firebird etc..

deniszykov.WebSocketListener by: Valeriano Tortola, Denis Zykov

A lightweight and highly scalable asynchronous WebSocket listener for .NET Core, .NET and Mono. https://github.com/deniszykov/WebSocketListener

DocumentFormat.OpenXml by: Microsoft

The Open XML SDK provides tools for working with Office Word, Excel, and PowerPoint documents. It supports scenarios such as: - High-performance generation of word-processing documents, spreadsheets, and presentations. - Populating content in Word files from an XML data source. - Splitting up (shredding) a Word or PowerPoint file into multiple files, and combining multiple Word/PowerPoint files into a single file. - Extraction of data from Excel documents. - Searching and replacing content in Word/PowerPoint using regular expressions. - Updating cached data and embedded spreadsheets for charts in Word/PowerPoint. - Document modification, such as removing tracked revisions or removing unacceptable content from documents.

EPPlus by: EPPlus Software AB

A spreadsheet library for .NET framework and .NET core

Fable by: Alfonso García-Caro Núñez

F# to JS compiler

FastEndpoints by: FastEndpoints

A light-weight REST Api framework for ASP.Net 6 and newer that implements REPR (Request-Endpoint-Response) Pattern.

FluentAssertions by: Dennis Doomen

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. Targets .NET Framework 4.5, .NET Standard 1.4, 1.6 and 2.0. Supports the unit test frameworks MSTest, MSTest2, Gallio, NUnit, XUnit, MBUnit, MSpec, and NSpec.

FluentValidation by: Jeremy Skinner

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

Grpc.AspNetCore.Server by: The gRPC Authors

gRPC support for ASP.NET Core

Grpc.AspNetCore.Server.ClientFactory by: The gRPC Authors

HttpClientFactory integration the for gRPC .NET client when running in ASP.NET Core

Grpc.Core by: The gRPC Authors

C# implementation of gRPC based on native gRPC C-core library.

Grpc.Net.ClientFactory by: The gRPC Authors

HttpClientFactory integration the for gRPC .NET client

Grpc.Net.Common by: The gRPC Authors

Infrastructure for common functionality in gRPC

Grpc.Reflection by: The gRPC Authors

gRPC C# Server Reflection

Grpc.Tools by: Google Inc.

Precompiled protobuf compiler and gRPC protobuf compiler plugin for generating gRPC client/server C# code. Binaries are available for Windows, Linux and MacOS.