NUnit.Extension.VSProjectLoader by: Charlie Poole

This extension allows NUnit to recognize and load solutions and projects in Visual Studio format. It supports files of type .sln, .csproj, .vbproj, .vjsproj, .vcproj and .fsproj.

NUnit3TestAdapter by: Charlie Poole

A package including the NUnit 3 TestAdapter for Visual Studio 2012 onwards. With this package you don't need to install the VSIX adapter package, and you don't need to upload the adapter to your TFS server. Note that this package ONLY contains the adapter, not the NUnit framework. You must also get the framework. You only need one such package for a solution. The package works with Visual Studio 2012 and newer.

NunitXml.TestLogger by: spekt

Xml logger for NUnit v3 compliant xml report when test is running with "dotnet test" or "dotnet vstest".

NuSpec.ReferenceGenerator by: Oren Novotny

Tool to auto-generate BCL package nuspec dependencies for CoreCLR projects

OneOf by: Harry McIntyre

F#-like discriminated unions for C#

OpenCover by: shaun wilde OpenCover

An open source code coverage tool (branch and sequence point) for all .NET Frameworks 2 and above (including Silverlight). Also capable of handling 32 and 64 bit processes. Use ReportGenerator for best viewing results (also available via Nuget).

OpenCoverToCoberturaConverter by: Daniel Palme

Converts OpenCover reports to Cobertura reports.

OpenTracing by: The OpenTracing Authors

This library is a .NET implementation of the OpenTracing API. To fully understand this platform API, it's helpful to be familiar with the OpenTracing project and terminology more generally. For the time being, mild backwards-incompatible changes may be made without changing the major version number. As OpenTracing and opentracing-csharp mature, backwards compatibility will become more of a priority.

pclcrypto by: Andrew Arnott

PCL Crypto provides a consistent, portable set of crypto APIs for .NET 4.5, Windows Phone 8.0 SL & 8.1 Xaml, Windows Store, Xamarin.iOS, Xamarin.Android. This makes it easier to create cross-platform .NET libraries and apps. Crypto functionality includes asymmetric and symmetric encryption and signatures, and key derivation. PCLCrypto calls into each native platform's crypto API for maximum performance. For RSA operations this produces a 2-100X improvement in performance on Android and iOS over using the standard RSACryptoServiceProvider API.

PCLCrypto by: Andrew Arnott

PCL Crypto provides a consistent, portable set of crypto APIs for .NET 4.5, Windows Phone 8.0 SL & 8.1 Xaml, Windows Store, Xamarin.iOS, Xamarin.Android. This makes it easier to create cross-platform .NET libraries and apps. Crypto functionality includes asymmetric and symmetric encryption and signatures, and key derivation. PCLCrypto calls into each native platform's crypto API for maximum performance. For RSA operations this produces a 2-100X improvement in performance on Android and iOS over using the standard RSACryptoServiceProvider API.

Penneo.SDK by: Penneo

SDK for using Penneo in your own C# projects

PhotoSauce.MagicScaler by: PhotoSauce

High-Quality, High-Performance image scaling library. Implements best-of-breed algorithms and linear light processing with speed and efficiency that can't be matched by GDI+.

Polly by: Michael Wolfenden App vNext

Polly is a .NET 4.5 / .NET Standard 1.0 library that allows developers to express resilience and transient fault handling policies such as Retry, Circuit Breaker, Timeout, Bulkhead Isolation and Fallback in a fluent and thread-safe manner.

Polly-Signed by: Michael Wolfenden App vNext

Polly is a .NET 4.5 / .NET Standard 1.0 library that allows developers to express resilience and transient fault handling policies such as Retry, Circuit Breaker, Timeout, Bulkhead Isolation and Fallback in a fluent and thread-safe manner.

PolySharp by: Sergio Pedri

PolySharp provides generated, source-only polyfills for C# language features, to easily use all runtime-agnostic features downlevel

popper.js by: FezVrasta

A kickass library to manage your poppers

Portable.BouncyCastle by: Oren Novotny

BouncyCastle portable version with support for .NET 4, .NET Standard 1.0-2.0, .NET Core

Portable.ConcurrentDictionary by: Stef Heyenrath

This is a .NET Standard 1.0, .NET 2.0, .NET 3.5, Silverlight 5.0 and Windows Phone Silverlight 8.0 & 8.1 backport from System.Collections.Concurrent.ConcurrentDictionary as defined in .NET Core

protobuf-net by: Marc Gravell

Provides simple access to fast and efficient "Protocol Buffers" serialization from .NET applications

Quartz by: Marko Lahma

Quartz.NET Scheduling Framework for .NET Platform

Radzen.Blazor by: Radzen Ltd.

Radzen Blazor is a set of 90+ free native Blazor UI controls packed with DataGrid, Scheduler, Charts and robust theming including Material design and Fluent UI.