System.ServiceModel.Http by: Microsoft

Provides the types that permit SOAP messages to be exchanged using Http (example: BasicHttpBinding).

System.ServiceModel.NetTcp by: Microsoft

Provides the types that permit SOAP messages to be exchanged using TCP (example: NetTcpBinding).

System.ServiceModel.Primitives by: Microsoft

Provides the common types used by all of the WCF libraries.

System.ServiceModel.Security by: Microsoft

Provides the types that support additional security features.

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 by: Microsoft

Provides base abstract encoding classes for converting blocks of characters to and from blocks of bytes. Commonly Used Types: System.Text.Encoding System.Text.DecoderFallbackException System.Text.Decoder System.Text.EncoderFallbackException System.Text.Encoder System.Text.EncoderFallback System.Text.EncoderFallbackBuffer System.Text.DecoderFallback System.Text.DecoderFallbackBuffer System.Text.DecoderExceptionFallback When using NuGet 3.x this package requires at least version 3.4.

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 When using NuGet 3.x this package requires at least version 3.4.

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 When using NuGet 3.x this package requires at least version 3.4.

System.Text.Json by: Microsoft

Provides high-performance and low-allocating types that serialize objects to JavaScript Object Notation (JSON) text and deserialize JSON text to objects, with UTF-8 support built-in. Also provides types to read and write JSON text encoded as UTF-8, and to create an in-memory document object model (DOM), that is read-only, for random access of the JSON elements within a structured view of the data. Commonly Used Types: System.Text.Json.JsonSerializer System.Text.Json.JsonDocument System.Text.Json.JsonElement System.Text.Json.Utf8JsonWriter System.Text.Json.Utf8JsonReader

System.Text.RegularExpressions by: Microsoft

Provides the System.Text.RegularExpressions.Regex class, an implementation of a regular expression engine. Commonly Used Types: System.Text.RegularExpressions.Regex System.Text.RegularExpressions.RegexOptions System.Text.RegularExpressions.Match System.Text.RegularExpressions.Group System.Text.RegularExpressions.Capture System.Text.RegularExpressions.MatchEvaluator When using NuGet 3.x this package requires at least version 3.4.

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 When using NuGet 3.x this package requires at least version 3.4.

System.Threading.Tasks by: Microsoft

Provides types that simplify the work of writing concurrent and asynchronous code. Commonly Used Types: System.Threading.Tasks.Task<TResult> System.Runtime.CompilerServices.TaskAwaiter<TResult> System.Threading.Tasks.TaskCompletionSource<TResult> System.Threading.Tasks.Task System.OperationCanceledException System.AggregateException When using NuGet 3.x this package requires at least version 3.4.

System.Threading.Tasks.Dataflow by: Microsoft

TPL Dataflow promotes actor/agent-oriented designs through primitives for in-process message passing, dataflow, and pipelining. TDF builds upon the APIs and scheduling infrastructure provided by the Task Parallel Library (TPL), and integrates with the language support for asynchrony provided by C#, Visual Basic, and F#. Commonly Used Types: System.Threading.Tasks.Dataflow.ActionBlock<TInput> System.Threading.Tasks.Dataflow.BatchBlock<T> System.Threading.Tasks.Dataflow.BatchedJoinBlock<T1, T2> System.Threading.Tasks.Dataflow.BatchedJoinBlock<T1, T2, T3> System.Threading.Tasks.Dataflow.BroadcastBlock<T> System.Threading.Tasks.Dataflow.BufferBlock<T> System.Threading.Tasks.Dataflow.DataflowBlock System.Threading.Tasks.Dataflow.JoinBlock<T1, T2> System.Threading.Tasks.Dataflow.JoinBlock<T1, T2, T3> System.Threading.Tasks.Dataflow.TransformBlock<TInput, TOutput> System.Threading.Tasks.Dataflow.TransformManyBlock<TInput, TOutput> System.Threading.Tasks.Dataflow.WriteOnceBlock<T> When using NuGet 3.x this package requires at least version 3.4.

System.Threading.Tasks.Extensions by: Microsoft

Provides additional types that simplify the work of writing concurrent and asynchronous code. Commonly Used Types: System.Threading.Tasks.ValueTask<TResult> 7601f4f6225089ffb291dc7d58293c7bbf5c5d4f

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 When using NuGet 3.x this package requires at least version 3.4.

System.ValueTuple by: Microsoft

Provides the System.ValueTuple structs, which implement the underlying types for tuples in C# and Visual Basic. Commonly Used Types: System.ValueTuple System.ValueTuple<T1> System.ValueTuple<T1, T2> System.ValueTuple<T1, T2, T3> System.ValueTuple<T1, T2, T3, T4> System.ValueTuple<T1, T2, T3, T4, T5> System.ValueTuple<T1, T2, T3, T4, T5, T6> System.ValueTuple<T1, T2, T3, T4, T5, T6, T7> System.ValueTuple<T1, T2, T3, T4, T5, T6, T7, TRest> 30ab651fcb4354552bd4891619a0bdd81e0ebdbf When using NuGet 3.x this package requires at least version 3.4.

System.Xml.ReaderWriter by: Microsoft

Provides provides a fast, non-cached, forward-only way to read and write Extensible Markup Language (XML) data. Commonly Used Types: System.Xml.XmlNodeType System.Xml.XmlException System.Xml.XmlReader System.Xml.XmlWriter System.Xml.IXmlLineInfo System.Xml.XmlNameTable System.Xml.IXmlNamespaceResolver System.Xml.XmlNamespaceManager System.Xml.XmlQualifiedName When using NuGet 3.x this package requires at least version 3.4.

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 When using NuGet 3.x this package requires at least version 3.4.

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 When using NuGet 3.x this package requires at least version 3.4.

TinyIoC by: Steven Robbins

An easy to use, hassle free, Inversion of Control Container for small projects, libraries and beginners alike