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.Fonts by: Six Labors and contributors

A cross-platform library for loading and laying out for processing and measuring; written in C#

SixLabors.ImageSharp by: Six Labors and contributors

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

SixLabors.ImageSharp.Drawing by: SixLabors and contributors

An extension to ImageSharp that allows the drawing of images, paths, and text.

SixLabors.Shapes by: Six Labors and contributors

Polygon manipulation/merging and interrogation library. It's a fully managed netstandard library so should work everywhere.

SixLabors.Shapes.Text by: Six Labors and contributors

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

smtpapi by: Brandon West

Easily build SendGrid SMTPAPI headers.

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

Sprache by: Nicholas Blumhardt, Contributors

Sprache is a simple, lightweight library for constructing parsers directly in C# code.

SQLite by: SQLite Development Team

SQLite is a software library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. This package contains native libraries for SQLite on Linux, macOS, and Windows (desktop and Universal Windows apps).