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.

OpenCover by: shaun wilde OpenCover

An open source code coverage tool (branch and sequence point) for all .NET Frameworks 2 and above (including Silverlight). Also capable of handling 32 and 64 bit processes. Use ReportGenerator for best viewing results (also available via Nuget).

OpenCoverToCoberturaConverter by: Daniel Palme

Converts OpenCover reports to Cobertura reports.

OpenGraph-Net by: ghorsey

OpenGraph-Net

OpenPop.NET by: OpenPop

OpenPop.NET is an open source implementation of a POP3 client and a robust MIME parser written in C#. It allows developers easy access to email on a POP3 server in a matter of minutes. The project is backed by several hundred test cases and is therefore believed to be very robust. If you find a bug, please report this by sending an email to hpop-users@lists.sourceforge.net. POP3 Client Features - Easy to use POP3 client - Support for plain TCP or TLS/SSL connections - Authentication methods supported - - Plain - - APOP - - CRAM-MD5 (RFC 2195) - CAPA capabilities command supported (RFC 2449) MIME Parsing Features - Preserves the MIME email hierarchy - Easy access to different MediaType parts of the email - Headers are parsed into strong types and are easy to examine - Includes robust decoders for - - QuotedPrintable - - Base64 - - EncodedWord - - Continuation and encoding of header fields (RFC 2231) - Emails are fully persistable

OpenTelemetry by: OpenTelemetry Authors

OpenTelemetry .NET SDK

OpenTelemetry.Api by: OpenTelemetry Authors

OpenTelemetry .NET API

OpenTelemetry.Instrumentation.Http by: OpenTelemetry Authors

Http instrumentation for OpenTelemetry .NET

OpenTelemetry.Instrumentation.SqlClient by: OpenTelemetry Authors

SqlClient instrumentation for OpenTelemetry .NET

OpenTracing by: The OpenTracing Authors

This library is a .NET implementation of the OpenTracing API. To fully understand this platform API, it's helpful to be familiar with the OpenTracing project and terminology more generally. For the time being, mild backwards-incompatible changes may be made without changing the major version number. As OpenTracing and opentracing-csharp mature, backwards compatibility will become more of a priority.

OpenTracing.Contrib.Grpc by: Benjamin Krämer

Adds OpenTracing instrumentation for .NET Standard apps that use GRPC.

Owin by: OWIN startup components contributors

OWIN IAppBuilder startup interface

Panic.StringUtils by: Panic.StringUtils

Panic.StringUtils

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.

Penneo.SDK by: Penneo

SDK for using Penneo in your own C# projects

PhotoSauce.MagicScaler by: PhotoSauce

High-Quality, High-Performance image scaling library. Implements best-of-breed algorithms and linear light processing with speed and efficiency that can't be matched by GDI+.

PInvoke.BCrypt by: Andrew Arnott

P/Invoke methods for the Windows BCrypt.dll.

PInvoke.Kernel32 by: Andrew Arnott

P/Invoke methods for the Windows Kernel32.dll.

PInvoke.NCrypt by: Andrew Arnott

P/Invoke methods for the Windows NCrypt.dll.