NuSpec.ReferenceGenerator by: Oren Novotny

Tool to auto-generate BCL package nuspec dependencies for CoreCLR projects

Octokit by: GitHub

An async-based GitHub API client library for .NET and .NET Core

OneOf by: Harry McIntyre

F# style discriminated unions for C#, using a custom type OneOf<T0, ... Tn> which holds a single value and has a .Match(...) method on it for exhaustive matching. Simple but powerful.

OPCFoundation.NetStandard.Opc.Ua by: OPC Foundation

This package contains the OPC UA reference implementation and is targeting the .NET Standard Library.

OpcUaHelper by: Richard.Hu

OPC UA客户端组件，提供一个opc ua的二次扩展类，方便的读写节点，浏览节点，并实现一个节点浏览器。

Open-Xml-PowerTools by: Microsoft

The Open XML PowerTools provides guidance and example code for programming with Open XML Documents (DOCX, XLSX, and PPTX). It is based on, and extends the functionality of the Open XML SDK. It supports scenarios such as: •Splitting DOCX/PPTX files into multiple files. •Combining multiple DOCX/PPTX files into a single file. •Populating content in template DOCX files with data from XML. •High-fidelity conversion of DOCX to HTML. •Searching and replacing content in DOCX/PPTX using regular expressions. •Managing tracked-revisions, including detecting tracked revisions, and accepting tracked revisions. •Updating Charts in DOCX/PPTX files, including updating cached data, as well as the embedded XLSX. •Retrieving metrics from DOCX files, including the hierarchy of styles used, the languages used, and the fonts used. •Writing XLSX files using far simpler code than directly writing the markup, including a streaming approach that enables writing XLSX files with millions of rows.

OpenTelemetry.Api by: OpenTelemetry authors

OpenTelemetry .NET instrumentation API

OpenTK by: Team OpenTK

The Open Toolkit is set of fast, low-level C# bindings for OpenGL, OpenGL ES, OpenAL and OpenCL. It runs on all major platforms and powers hundreds of apps, games and scientific research. It provides bindings for GLFW windowing, input and a game loop, and is the perfect start for your own game engine. OpenTK comes with simple and easy to follow tutorials for learning *modern* OpenGL. These are written by the community and represent all of the best practices to get you started. Learn how to use OpenTK here: https://opentk.net/learn/index.html Sample projects that accompany the tutorial can be found here: https://github.com/opentk/LearnOpenTK We have a very active discord server, if you need help, want to help, or are just curious, come join us! https://discord.gg/6HqD48s

OpenTK.GLControl by: The Open Toolkit Team

The Open Toolkit is set of fast, low-level C# bindings for OpenGL, OpenGL ES and OpenAL. It runs on all major platforms and powers hundreds of apps, games and scientific research. OpenTK provides several utility libraries, including a math/linear algebra package, a windowing system, and input handling.

OpenTK.redist.glfw by: Team OpenTK

GLFW redistributables for OpenTK.

opentoolkit.redist.glfw by: OpenToolkit

GLFW redistributables for OpenTK.

Oracle.ManagedDataAccess by: Oracle

ODP.NET, Managed Driver is a 100% native code .NET Framework driver for Oracle Database. No additional Oracle Client software is required to be installed to connect to Oracle Database.

Oscar.Data.SqlClient by: microestc@outlook.com

神通数据库驱动提供程序基于 .NET Framework 2.0 、.NET Framework 3.5 和 .NET Standard2.0(TFM) .NET API 规范编写, 支持.NET Framework >=2.0 以及 .NET Core 2.0 至 .NET 6, .NET 7, .NET 8

Owin by: OWIN startup components contributors

OWIN IAppBuilder startup interface

OxyPlot.Core by: OxyPlot

OxyPlot is a plotting library for .NET. This is the core library including the foundation classes and plot model. To display the plots, you also need to add a platform-specific OxyPlot package that contains a PlotView component.

OxyPlot.WindowsForms by: OxyPlot.WindowsForms

OxyPlot is a plotting library for .NET. This package targets Windows Forms applications.

Pathoschild.Http.FluentClient by: Pathoschild

A modern async HTTP client for REST APIs. Its fluent interface lets you send an HTTP request and parse the response in one go.

PCLCrypto by: Andrew Arnott

PCL Crypto provides a consistent, portable set of crypto APIs for .NET 4.5, Windows Phone 8.0 SL & 8.1 Xaml, Windows Store, Xamarin.iOS, Xamarin.Android. This makes it easier to create cross-platform .NET libraries and apps. Crypto functionality includes asymmetric and symmetric encryption and signatures, and key derivation. PCLCrypto calls into each native platform's crypto API for maximum performance. For RSA operations this produces a 2-100X improvement in performance on Android and iOS over using the standard RSACryptoServiceProvider API.

pclcrypto by: Andrew Arnott

PCL Crypto provides a consistent, portable set of crypto APIs for .NET 4.5, Windows Phone 8.0 SL & 8.1 Xaml, Windows Store, Xamarin.iOS, Xamarin.Android. This makes it easier to create cross-platform .NET libraries and apps. Crypto functionality includes asymmetric and symmetric encryption and signatures, and key derivation. PCLCrypto calls into each native platform's crypto API for maximum performance. For RSA operations this produces a 2-100X improvement in performance on Android and iOS over using the standard RSACryptoServiceProvider API.

PCLStorage by: Daniel Plaisted

PCL Storage provides a consistent, portable set of local file IO APIs for .NET, Windows Phone, Windows Store, Xamarin.iOS, Xamarin.Android, and Silverlight. This makes it easier to create cross-platform .NET libraries and apps.

PetaPoco.Compiled by: PetaPoco

A Tiny ORMish thing for your POCO's.