FastExpressionCompiler.src by: Maksim Volkau

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

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 test. Runs on 4.0 and 4.5 (Desktop and Windows Store), CoreCLR, Silverlight 5 and Windows Phone 8, 8.1 and 8.1 for Silverlight. Supports the unit test frameworks MSTest, MSTest2, NUnit, XUnit, XUnit2, MBUnit, Gallio, MSpec, and NSpec.

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.

GeoAPI.Core by: NetTopologySuite Team and Fabrício Godoy

GeoAPI.NET project provides a common framework based on OGC/ISO standards to improve interoperability among .NET GIS projects.

Gherkin by: Cucumber Ltd, Gaspar Nagy

Cross-platform parser for the Gherkin language, used by Cucumber, SpecFlow and other Cucumber-based tools to parse feature files.

Google.Protobuf by: Google Inc.

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

Grpc by: The gRPC Authors

Metapackage for gRPC C#

Grpc.AspNetCore by: The gRPC Authors

gRPC meta-package for ASP.NET Core

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. Note that the Grpc.Core implementation of gRPC for C# is in maintenance mode and will be replaced by grpc-dotnet in the future. See https://grpc.io/blog/grpc-csharp-future/ for details.

Grpc.Core.Api by: The gRPC Authors

gRPC C# Surface API

Grpc.Net.Client by: The gRPC Authors

.NET client for gRPC

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: The gRPC Authors

gRPC and Protocol Buffer compiler for C# projects

Handlebars.Net by: Rex Morgan

Blistering-fast Handlebars.js templates in your .NET application.

HarfBuzzSharp.NativeAssets.macOS by: Microsoft

HarfBuzzSharp is a cross-platform OpenType text shaping engine for .NET platforms.

HtmlAgilityPack by: ZZZ Projects, Simon Mourrier, Jeff Klawiter, Stephan Grell

This is an agile HTML parser that builds a read/write DOM and supports plain XPATH or XSLT (you actually don't HAVE to understand XPATH nor XSLT to use it, don't worry...). It is a .NET code library that allows you to parse "out of the web" HTML files. The parser is very tolerant with "real world" malformed HTML. The object model is very similar to what proposes System.Xml, but for HTML documents (or streams).