NuGet.Common by: Microsoft

Common utilities and interfaces for all NuGet libraries.

NuGet.Logging by: NuGet

Logger abstractions for NuGet

NuGet.Packaging.Core by: Microsoft

The core data structures for NuGet.Packaging

NuGet.Packaging.Core.Types by: NuGet.Packaging.Core.Types

NuGet v3 core library.

NuGet.Protocol.Core.Types by: NuGet

NuGet's protocol-level base types used for connecting to API v2 and API v3 repositories.

NuGet.Protocol.Core.v3 by: NuGet

NuGet Protocol for 3.1.0 servers

NuGet.Repositories by: NuGet.Repositories

NuGet v3 core library.

NuGet.RuntimeModel by: NuGet.RuntimeModel

NuGet v3 core library.

NuGet.VisualStudio by: Microsoft

APIs for invoking NuGet services in Visual Studio.

Nullable by: Manuel Römer

A source code only package which allows you to use .NET's new nullable attributes in older target frameworks like .NET Standard 2.0 or the "old" .NET Framework. This package does not contain any compiled binaries, but instead adds the attribute classes as C# source code to your project. Because this code is compiled together with the rest of your code, the built binaries will not have a dependency on this package, meaning that you can perfectly use it for both libraries and applications. The C# code is only included if you are targeting a framework version which does not support the new nullable attributes. For example, if you create a library which multi-targets .NET Standard 2.0 and 2.1, the majority of the attributes are not included in the .NET Standard 2.1 version, because it already provides these by default. Please see https://github.com/manuelroemer/Nullable for additional information on how to use this package.

NuSpec.ReferenceGenerator by: Oren Novotny

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

odp.net.x64 by: Oracle

This NuGet package contains Oracle.DataAccess.dll (x64- both the net20 and net40 versions) needed to compile a project that uses Oracle's ODP.NET Library. Oracle will still need to be installed on the production or development machine in order to connect to Oracle (those libraries are greater than 100MB in size, so it didn't make sense to include them in a NuGet package), but this package will at least allow the project to be successfully built (i.e. if you're using a CI server).

odp.net.x86 by: Oracle

This NuGet package contains Oracle.DataAccess.dll (x86 - both the net20 and net40 versions) needed to compile a project that uses Oracle's ODP.NET Library. Oracle will still need to be installed on the production or development machine in order to connect to Oracle (those libraries are greater than 100MB in size, so it didn't make sense to include them in a NuGet package), but this package will at least allow the project to be successfully built (i.e. if you're using a CI server).

OneOf by: Harry McIntyre

F# style discriminated unions for C#, using a custom type OneOf<T0, ... Tn> which holds a single value and has a .Match(...) method on it for exhaustive matching. Simple but powerful.

OpenIddict.EntityFrameworkCore.Models by: Kévin Chalet

Relational entities for the Entity Framework Core stores.

OpenPop by: OpenPop

POP3 Mail Library

OpenTelemetry.Api by: OpenTelemetry authors

OpenTelemetry .NET instrumentation API

OpenXmlSdk by: Microsoft

An unofficial package of Microsoft's OpenXML SDK. If anyone has a concern about this, please contact me! Description from Microsoft: The Open XML SDK 2.0 simplifies the task of manipulating Open XML packages and the underlying Open XML schema elements within a package. The Open XML SDK 2.0 encapsulates many common tasks that developers perform on Open XML packages, so that you can perform complex operations with just a few lines of code.

Owin by: OWIN startup components contributors

OWIN IAppBuilder startup interface

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.