SharpPcap by: Chris Morgan

SharpPcap is a cross-platform(Windows, Mac, Linux) packet capture framework for the .NET environment. It provides an API for capturing, injecting, analyzing and building packets using any .NET language such as C# and VB.NET.

SharpZipLib by: http://www.icsharpcode.net/

#ziplib (SharpZipLib, formerly NZipLib) is a Zip, GZip, Tar and BZip2 library written entirely in C# for the .NET platform. It is implemented as an assembly (installable in the GAC), and thus can easily be incorporated into other projects (in any .NET language).

Shouldly by: Jake Ginnivan, Joseph Woodward, Simon Cropp

Shouldly - Assertion framework for .NET. The way asserting *Should* be

SixLabors.Core by: Six Labors

Low level primitives for use across Six Labors projects..

SixLabors.ImageSharp by: Six Labors and contributors

A new, fully featured, fully managed, cross-platform, 2D graphics API for .NET

SixLabors.ImageSharp.Drawing by: Six Labor and contributors

An extension to ImageSharp that allows the drawing of images, paths, and text. This is the official release of ImageSharp.Drawing by the Six Labors team who own the ImageSharp codebase.

SixLabors.Shapes by: Scott Williams and contributors

Polygon manipulation/merging and interrogation library. Its a fully manged netstandard library so should work everywhere.

SixLabors.Shapes.Text by: Scott Williams and contributors

Allows generating glyphs for text and a font for manipulation using SixLabors.Shapes

smtpapi by: Brandon West

Easily build SendGrid SMTPAPI headers.

Snappy.NET by: Robert Važan

Snappy is an extremely fast compressor (250MB/s) and decompressor (500MB/s). Snappy.NET is a P/Invoke wrapper around native Snappy, which additionally implements Snappy framing/streaming format.

SocketIoClientDotNet by: Matthias Ludwig

This is the Socket.IO Client Library for .NET.

SourceLink.Create.CommandLine by: Cameron Taggart

SourceLink: Source Code On Demand Source Link your Portable PDB files to allow source code to be downloaded on demand

SpecFlow by: SpecFlow Team

SpecFlow aims at bridging the communication gap between domain experts and developers by binding business readable behavior specifications to the underlying implementation. Our mission is to provide a pragmatic and frictionless approach to Acceptance Test Driven Development and Behavior Driven Development for .NET projects today.

SpecFlow.CustomPlugin by: TechTalk

Package for writing custom extensions for SpecFlow.

SpecFlow.NUnit by: SpecFlow Team

Package to use SpecFlow with NUnit 3.13 and later

SpecFlow.Plus.LivingDocPlugin by: SpecFlow Team

A plugin for SpecFlow to generate a shareable HTML Gherkin feature execution report (living documentation). Use together with SpecFlow.Plus.LivingDoc.CLI.

SpecFlow.Tools.MsBuild.Generation by: SpecFlow Team

Package to enable the code-behind file generation during build time http://specflow.org/documentation/Generate-Tests-from-MsBuild/

SpecRun.Runner by: SpecFlow Team

SpecFlow+Runner - supports SpecRun.SpecFlow and SpecRun.NUnit packages.

Splat by: Paul Betts

A library to make things cross-platform that should be

SpookilySharp by: Jon Hanna

A .NET/Mono implementation of Bob Jenkins’ SpookyHash version 2. Offers 32-, 64- and 128-bit hashes of strings, char and byte arrays, streams and any type of object represented by an array of simple types.