System.ServiceModel.Security by: Microsoft

Provides common security types for consuming and communicating with services. Commonly Used Types: System.ServiceModel.DnsEndpointIdentity System.ServiceModel.MessageSecurityVersion System.ServiceModel.UpnEndpointIdentity System.ServiceModel.SpnEndpointIdentity

System.Spatial by: Microsoft Corporation

Contains classes and methods that facilitate geography and geometry spatial operations. Targets .NET 4.0, Silverlight 4.0 or .NET Portable Lib with support for .NET 4.0, SL 5.0, Win Phone 8, Win Phone 8.1, and Win 8. Localized for CHS, CHT, DEU, ESN, FRA, ITA, JPN, KOR and RUS.

System.Text.Encoding.Extensions by: Microsoft

Provides support for specific encodings, including ASCII, UTF-7, UTF-8, UTF-16, and UTF-32. Commonly Used Types: System.Text.UTF8Encoding System.Text.UnicodeEncoding System.Text.ASCIIEncoding System.Text.UTF7Encoding System.Text.UTF32Encoding

System.Threading by: Microsoft

Provides the fundamental synchronization primitives, including System.Threading.Monitor and System.Threading.Mutex, that are required when writing asynchronous code. Commonly Used Types: System.Threading.Monitor System.Threading.SynchronizationContext System.Threading.ManualResetEvent System.Threading.AutoResetEvent System.Threading.ThreadLocal<T> System.Threading.EventWaitHandle System.Threading.SemaphoreSlim System.Threading.Mutex

System.Threading.Tasks by: Robert McLaws, Jrmie "Garuma" Laval

This package is a port of the Mono version of the *complete* Task Parallel Library (not a subset) to .NET 3.5, as well as all Silverlight platforms, including Windows Phone 7.X. This version contains more classes (and is namespace compatible with the BCL) compared to the PortableTPL project. This project supercedes the TaskParallelLibrary.WP7 package, and is licensed under the same licenses as the rest of the Mono framework.

Tizen.NET.API5 by: Samsung Electronics

Reference assemblies of Tizen .NET API Level 5.

Twilio by: Twilio

Twilio REST API helper library

WindowsAzure.Storage by: Microsoft

This client library enables working with the Microsoft Azure storage services which include the blob and file service for storing binary and text data, the table service for storing structured non-relational data, and the queue service for storing messages that may be accessed by a client. For this release see notes - https://github.com/Azure/azure-storage-net/blob/master/README.md and https://github.com/Azure/azure-storage-net/blob/master/changelog.txt Microsoft Azure Storage team's blog - http://blogs.msdn.com/b/windowsazurestorage/

Xamarin.Android.Support.Core.UI by: Xamarin Inc.

Core UI Android Support Library C# bindings for Xamarin

Xamarin.Android.Support.Media.Compat by: Xamarin Inc.

Media Compat Android Support Library C# bindings for Xamarin

Xamarin.Android.Support.v13 by: Xamarin Inc.

v13 Android Support Library C# bindings for Xamarin

Xamarin.Android.Support.v4 by: Xamarin Inc.

v4 Android Support Library C# bindings for Xamarin

Xamarin.AndroidX.Migration by: Microsoft

This package provides a set of tools and MSBuild tasks to aid in the migration from Android Support to Android X.

Xamarin.Build.Download by: Microsoft

Support for downloading and unpacking archives when building MSBuild projects

Xamarin.Firebase.iOS.Core by: Microsoft

C# bindings for Firebase APIs Core iOS Library

Xamarin.Firebase.iOS.Crashlytics by: Microsoft

C# bindings for Firebase APIs Crashlytics iOS Library

Xamarin.Firebase.iOS.RemoteConfig by: Microsoft

C# bindings for Firebase APIs Remote Config iOS Library

Xamarin.Google.iOS.Core by: Xamarin Inc.

C# bindings for Google APIs Core iOS Library

Xamarin.Google.iOS.SignIn by: Microsoft

C# bindings for Google APIs Sign In iOS Library

xunit by: jnewkirk, bradwilson

xUnit.net is a developer testing framework, built to support Test Driven Development, with a design goal of extreme simplicity and alignment with framework features. Installing this package installs xunit.core, xunit.assert, and xunit.analyzers.