Stateless by: Stateless Contributors

Create state machines and lightweight state machine-based workflows directly in .NET code

Stef.Validation by: Stef Heyenrath

Argument validation like: Guard.NotNull, Guard.NotNullOrEmpty, Guard.NotNullOrWhiteSpace, Guard.Condition en Guard.HasNoNulls.

Stimulsoft.Reports.Engine.NetCore by: Stimulsoft

The native .NET Core cross platform report engine is a part of the reporting tool for .NET Core and .NET frameworks, that renders reports from getting data from the source, building bands, calculating aggregate functions, charting, applying styles, conditions, filtering, sorting, and more. Also, the report engine has algorithms for exporting reports to various formats such as PDF, Rich Text, Excel, and others. This package is also intended for non-desktop Windows application models (WinUI 3, MAUI Windows, Uno Platform, and similar) whose target framework ends with "-windows" but do not use Windows Forms or WPF.

StreamJsonRpc by: Microsoft

A cross-platform .NET portable library that implements the JSON-RPC wire protocol and can use System.IO.Stream or WebSocket so you can use it with any transport.

Stripe.net by: Stripe, Jayme Davis

Stripe.net is a sync/async .NET 4.5+ client, and a portable class library for the Stripe API. (Official Library)

StrongNamer by: Daniel Plaisted

Strong Namer will automatically add strong names to referenced assemblies which do not already have a strong name.

StyleCop.Analyzers by: Sam Harwell et. al.

An implementation of StyleCop's rules using Roslyn analyzers and code fixes

StyleCop.Analyzers.Unstable by: Sam Harwell et. al.

An implementation of StyleCop's rules using Roslyn analyzers and code fixes

StyleCop.MSBuild by: StyleCop contributors, Chris Dahlberg

Integrates StyleCop "Classic" source code analysis into the build process of C# projects to enforce a set of style and consistency rules.

Stylet by: Antony Male

A very lightweight but powerful ViewModel-First MVVM framework for WPF, inspired by Caliburn.Micro. Comes with its own IoC container.

SubSonic by: Rob Conery

SubSonic is A Super High-fidelity Batman Utility Belt that works up your Data Access (using Linq in 3.0), throws in some much-needed utility functions, and generally speeds along your dev cycle.

Superpower by: Datalust, Superpower Contributors, Sprache Contributors

A parser combinator library for C#

SuperSocket by: Kerry Jiang

SuperSocket is a light weight, cross platform and extensible socket server application framework. You can use it to build a server side socket application (like game server, GPS server, industrial control system, data acquisition server etc) easily without thinking about how to use socket, how to maintain the socket connections and how socket works.

SuperSocket.ClientEngine.Core by: Kerry Jiang

It's a .NET socket tool which can simplify the socket client developing. This difference between this package and SuperSocket.ClientEngine is it doesn't include the protocol resolving library.

SuperSocket.ProtoBase by: Kerry Jiang

It is a network protocol resolving library which can be used in both server and client

SuperSocket.WebSocket by: Kerry Jiang

WebSocket server implementation base on SuperSocket. It is just the same codebase with SuperWebSocket but has different assembly name and namespace.

Svg by: mrbean-bremen, davescriven, jvenema, owaits, ddpruitt, Ralf1108, Tebjan Halm, and others

Public fork of the C# SVG rendering library on codeplex: https://svg.codeplex.com/ This started out as a minor modification to enable the writing of proper SVG strings. But now after almost two years we have so many fixes and improvements that we decided to share our current codebase to the public in order to improve it even further. So please feel free to fork it and open pull requests for any fix, improvement or feature you add. License: Microsoft Public License: https://svg.codeplex.com/license

Swashbuckle.AspNetCore by: domaindrivendev

Swagger tools for documenting APIs built on ASP.NET Core

Swashbuckle.AspNetCore.Annotations by: Swashbuckle.AspNetCore.Annotations

Provides custom attributes that can be applied to controllers, actions and models to enrich the generated Swagger

Swashbuckle.AspNetCore.ReDoc by: Swashbuckle.AspNetCore.ReDoc

Middleware to expose an embedded version of ReDoc from an ASP.NET Core application