System.IO.Hashing by: Microsoft

Provides non-cryptographic hash algorithms, such as CRC-32. Commonly Used Types: System.IO.Hashing.Crc32 System.IO.Hashing.XxHash32

System.IO.Packaging by: Microsoft

Provides classes that support storage of multiple data objects in a single container.

System.IO.Pipelines by: Microsoft

Single producer single consumer byte buffer management. Commonly Used Types: System.IO.Pipelines.Pipe System.IO.Pipelines.PipeWriter System.IO.Pipelines.PipeReader

System.IO.Pipes.AccessControl by: Microsoft

Provides types for managing access and audit control lists for pipes. Commonly Used Types: System.IO.Pipes.PipeSecurity System.IO.Pipes.PipeAccessRule System.IO.Pipes.PipeAuditRule System.IO.Pipes.PipeAccessRights When using NuGet 3.x this package requires at least version 3.4.

System.IO.UnmanagedMemoryStream by: Microsoft

Provides classes for access to unmanaged blocks of memory from managed code. Commonly Used Types: System.IO.UnmanagedMemoryStream System.IO.UnmanagedMemoryAccessor When using NuGet 3.x this package requires at least version 3.4.

System.Linq by: Microsoft

Provides classes and interfaces that supports queries that use Language-Integrated Query (LINQ). Commonly Used Types: System.Linq.Enumerable System.Linq.IGrouping<TKey, TElement> System.Linq.IOrderedEnumerable<TElement> System.Linq.ILookup<TKey, TElement> System.Linq.Lookup<TKey, TElement> When using NuGet 3.x this package requires at least version 3.4.

System.Linq.Async by: .NET Foundation and Contributors

Provides support for Language-Integrated Query (LINQ) over IAsyncEnumerable<T> sequences.

System.Linq.AsyncEnumerable by: Microsoft

System.Linq.AsyncEnumerable

System.Linq.Dynamic.Core by: ZZZ Projects, Stef Heyenrath, Microsoft, Scott Guthrie, King Wilder, Nathan Arnott

This is a .NETStandard / .NET Core port of the the Microsoft assembly for the .Net 4.0 Dynamic language functionality.

System.Linq.Expressions by: Microsoft

Provides classes, interfaces and enumerations that enable language-level code expressions to be represented as objects in the form of expression trees. Commonly Used Types: System.Linq.IQueryable<T> System.Linq.IQueryable System.Linq.Expressions.Expression<TDelegate> System.Linq.Expressions.Expression System.Linq.Expressions.ExpressionVisitor When using NuGet 3.x this package requires at least version 3.4.

System.Linq.Parallel by: Microsoft

Provides classes that supports parallel queries that use Language-Integrated Query (LINQ). Commonly Used Types: System.Linq.ParallelQuery<TSource> System.Linq.ParallelEnumerable System.Linq.ParallelQuery System.Linq.OrderedParallelQuery<TSource> When using NuGet 3.x this package requires at least version 3.4.

System.Linq.Queryable by: Microsoft

Provides classes for querying data structures that implement IQueryable<T>. Commonly Used Types: System.Linq.Queryable System.Linq.EnumerableQuery<T> System.Linq.EnumerableQuery When using NuGet 3.x this package requires at least version 3.4.

System.Management by: Microsoft

Provides access to a rich set of management information and management events about the system, devices, and applications instrumented to the Windows Management Instrumentation (WMI) infrastructure. Commonly Used Types: System.Management.ManagementClass System.Management.ManagementObject System.Management.SelectQuery

System.Memory by: Microsoft

System.Memory

System.Memory.Data by: Microsoft

A lightweight abstraction for a payload of bytes. Provides methods for converting between strings, streams, JSON, and bytes. Commonly Used Types: System.BinaryData

System.Net.Http by: Microsoft

Legacy package, System.Net.Http is now included in the 'Microsoft.Net.Http' package.

System.Net.Http.WinHttpHandler by: Microsoft

Provides a message handler for HttpClient based on the WinHTTP interface of Windows. While similar to HttpClientHandler, it provides developers more granular control over the application's HTTP communication than the HttpClientHandler. Commonly Used Types: System.Net.Http.WinHttpHandler

System.Net.ServerSentEvents by: Microsoft

Provides a simple parser for server-sent events (SSE). Commonly Used Types: System.Net.ServerSentEvents.SseParser

System.Net.WebHeaderCollection by: Microsoft

Contains types that represent HTTP request and response headers. This library is used with classes such as System.Net.HttpWebRequest and System.Net.HttpWebResponse and allows developers to query/edit header names/values. Commonly Used Types: System.Net.HttpRequestHeader System.Net.HttpResponseHeader System.Net.WebHeaderCollection When using NuGet 3.x this package requires at least version 3.4.

System.Net.WebSockets by: Microsoft

Provides the System.Net.WebSockets.WebSocket abstract class and related types to allow developers to implement the WebSocket protocol (RFC 6455). WebSockets provide full-duplex communication over a single TCP connection. Commonly Used Types: System.Net.WebSockets.WebSocket System.Net.WebSockets.WebSocketContext System.Net.WebSockets.WebSocketException When using NuGet 3.x this package requires at least version 3.4.