System.Threading.AccessControl by: Microsoft

Provides support for managing access and audit control lists for synchronization primitives. Commonly Used Types: System.Security.AccessControl.EventWaitHandleAccessRule System.Security.AccessControl.EventWaitHandleAuditRule System.Security.AccessControl.MutexAccessRule System.Security.AccessControl.MutexAuditRule System.Security.AccessControl.MutexSecurity System.Security.AccessControl.SemaphoreAccessRule System.Security.AccessControl.SemaphoreAuditRule System.Security.AccessControl.SemaphoreSecurity

System.Threading.Channels by: Microsoft

Provides types for passing data between producers and consumers. Commonly Used Types: System.Threading.Channel System.Threading.Channel<T>

System.Threading.Overlapped by: Microsoft

Provides common types for interacting with asynchronous (or overlapped) input and output (I/O). Commonly Used Types: System.Threading.NativeOverlapped System.Threading.Overlapped System.Threading.IOCompletionCallback

System.Threading.Timer by: Microsoft

Provides the System.Threading.Timer class, which is a mechanism for executing a method at specified intervals. Commonly Used Types: System.Threading.Timer System.Threading.TimerCallback

System.Xml.XmlSerializer by: Microsoft

Provides classes for serializing objects to the Extensible Markup Language (XML) and deserializing XML data to objects. Commonly Used Types: System.Xml.Serialization.IXmlSerializable System.Xml.Serialization.XmlSerializer System.Xml.Serialization.XmlIgnoreAttribute System.Xml.Serialization.XmlElementAttribute System.Xml.Serialization.XmlAttributeAttribute System.Xml.Serialization.XmlArrayAttribute System.Xml.Serialization.XmlRootAttribute System.Xml.Serialization.XmlArrayItemAttribute System.Xml.Serialization.XmlTypeAttribute System.Xml.Serialization.XmlEnumAttribute \r\n TFS ID: 1599443, GitHub SHA: https://github.com/dotnet/corefx/tree/eede273a4dfabcea608621f5e1bbf8ad00584cfb

Twilio by: Twilio

Twilio REST API helper library

ValueTupleBridge by: Nobuyuki Iwanaga

Backporting of System.ValueTuple for .NET 3.5.

Wcwidth by: Patrik Svensson, Phil Scott

A .NET library that calculates the width of Unicode characters.

Xamarin.Firebase.iOS.Core by: Microsoft

C# bindings for Firebase APIs Core iOS Library

xunit by: James Newkirk, Brad Wilson

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.

Xunit.SkippableFact by: Andrew Arnott

Make your Xunit test methods self-determine to report a "skipped" result. Useful for such cases as "not supported on this platform" results or other environmental inputs.