Polly by: Michael Wolfenden, App vNext

Polly is a .NET 3.5 / 4.0 / 4.5 / PCL library (Profile 259) that allows developers to express transient exception handling policies such as Retry, Retry Forever, Wait and Retry or Circuit Breaker in a fluent manner.

StackExchange.Redis.StrongName by: Stack Exchange inc., marc.gravell

High performance Redis client, incorporating both synchronous and asynchronous usage.

Swashbuckle.AspNetCore by: Swashbuckle.AspNetCore

Swagger tools for documenting APIs built on ASP.NET Core

System.Collections.Immutable by: Microsoft

This package provides collections that are thread safe and guaranteed to never change their contents, also known as immutable collections. Like strings, any methods that perform modifications will not change the existing instance but instead return a new instance. For efficiency reasons, the implementation uses a sharing mechanism to ensure that newly created instances share as much data as possible with the previous instance while ensuring that operations have a predictable time complexity. Commonly Used Types: System.Collections.Immutable.ImmutableArray System.Collections.Immutable.ImmutableArray<T> System.Collections.Immutable.ImmutableDictionary System.Collections.Immutable.ImmutableDictionary<TKey,TValue> System.Collections.Immutable.ImmutableHashSet System.Collections.Immutable.ImmutableHashSet<T> System.Collections.Immutable.ImmutableList System.Collections.Immutable.ImmutableList<T> System.Collections.Immutable.ImmutableQueue System.Collections.Immutable.ImmutableQueue<T> System.Collections.Immutable.ImmutableSortedDictionary System.Collections.Immutable.ImmutableSortedDictionary<TKey,TValue> System.Collections.Immutable.ImmutableSortedSet System.Collections.Immutable.ImmutableSortedSet<T> System.Collections.Immutable.ImmutableStack System.Collections.Immutable.ImmutableStack<T>

System.Diagnostics.Debug by: Microsoft

Provides classes and attributes that allows basic interaction with a debugger. Commonly Used Types: System.Diagnostics.Debug System.Diagnostics.DebuggerStepThroughAttribute System.Diagnostics.Debugger System.Diagnostics.DebuggerDisplayAttribute System.Diagnostics.DebuggerBrowsableAttribute System.Diagnostics.DebuggerBrowsableState System.Diagnostics.DebuggerHiddenAttribute System.Diagnostics.DebuggerNonUserCodeAttribute System.Diagnostics.DebuggerTypeProxyAttribute When using NuGet 3.x this package requires at least version 3.4.

System.Net.NetworkInformation by: Microsoft

Provides access to network traffic data, network address information, and notification of address changes for the local computer. Commonly Used Types: System.Net.NetworkInformation.NetworkInterface System.Net.NetworkInformation.NetworkInformationException System.Net.NetworkInformation.NetworkAddressChangedEventHandler System.Net.NetworkInformation.NetworkInterfaceType System.Net.NetworkInformation.OperationalStatus System.Net.NetworkInformation.IPGlobalProperties System.Net.NetworkInformation.UnicastIPAddressInformation System.Net.NetworkInformation.UnicastIPAddressInformationCollection System.Net.NetworkInformation.PhysicalAddress System.Net.NetworkInformation.TcpConnectionInformation

System.Net.Primitives by: Microsoft

Provides common types for network-based libraries, including System.Net.IPAddress, System.Net.IPEndPoint, and System.Net.CookieContainer. Commonly Used Types: System.Net.HttpStatusCode System.Net.Sockets.SocketError System.Net.Cookie System.Net.Sockets.SocketException System.Net.IPEndPoint System.Net.ICredentials System.Net.NetworkCredential System.Net.IPAddress System.Net.CookieCollection System.Net.CookieContainer

System.Runtime.Extensions by: Microsoft

Provides commonly-used classes for performing mathematical functions, conversions, string comparisons and querying environment information. Commonly Used Types: System.Math System.Environment System.Random System.Progress<T> System.Convert System.Diagnostics.Stopwatch System.Runtime.Versioning.FrameworkName System.StringComparer System.IO.Path

System.Text.Encodings.Web by: Microsoft

Provides types for encoding and escaping strings for use in JavaScript, HyperText Markup Language (HTML), and uniform resource locators (URL). Commonly Used Types: System.Text.Encodings.Web.HtmlEncoder System.Text.Encodings.Web.UrlEncoder System.Text.Encodings.Web.JavaScriptEncoder

System.Xml.XDocument by: Microsoft

Provides the classes for Language-Integrated Query (LINQ) to Extensible Markup Language (XML). LINQ to XML is an in-memory XML programming interface that enables you to modify XML documents efficiently and easily. Commonly Used Types: System.Xml.Linq.XElement System.Xml.Linq.XAttribute System.Xml.Linq.XDocument System.Xml.Linq.XText System.Xml.Linq.XNode System.Xml.Linq.XContainer System.Xml.Linq.XComment System.Xml.Linq.XObject System.Xml.Linq.XProcessingInstruction System.Xml.Linq.XDocumentType

Twilio by: Twilio

Twilio REST API helper library

Utf8Json by: neuecc

Definitely Fastest and Zero Allocation JSON Serializer for C#(NET, .NET Core, Unity, Xamarin).