Portable.ConcurrentDictionary by: Stef Heyenrath

This is a .NET Standard 1.0, .NET 2.0, .NET 3.5, Silverlight 5.0 and Windows Phone Silverlight 8.0 & 8.1 backport from System.Collections.Concurrent.ConcurrentDictionary as defined in .NET Core

Portable.JWT by: Mitja Bombac

JWT (JSON Web Token) Portable Implementation for .NET 4.5+ (Public Domain). Supported algorithms: HMAC signatures with HS256, HS384 and HS512.

Portable.System.DateTimeOnly by: Oleg Rakhmatulin

DateOnly and TimeOnly types for .NET versions before 6.0

postgrest-csharp by: Joseph Schultz <joseph@acupofjose.com>

Postgrest-csharp is written primarily as a helper library for supabase/supabase-csharp, however, it should be easy enough to use outside of the supabase ecosystem. The bulk of this library is a translation and c-sharp-ification of the supabase/postgrest-js library.

Pragmastat by: Andrey Akinshin

Pragmatic Statistical Toolkit

prometheus-net by: andrasm qed- lakario sandersaares

.NET client library for the Prometheus monitoring and alerting system

protobuf-net by: Marc Gravell

Provides simple access to fast and efficient "Protocol Buffers" serialization from .NET applications

protobuf-net.Core by: Marc Gravell

Provides simple access to fast and efficient "Protocol Buffers" serialization from .NET applications

PuppeteerSharp by: Darío Kondratiuk

Headless Browser .NET API

QRCoder by: Raffael Herrmann Shane Krueger

QRCoder is a simple library, written in C#.NET, which enables you to create QR codes.

QRCoder.Core by: Afonso Dutra Nogueira Filho

QRCoder.Core, written in C#.NET, which enables you to create QR codes.

QRCoder-ImageSharp by: Raffael Herrmann Joerg Plenert

QRCoder is a simple library, written in C#.NET, which enables you to create QR codes. Based on ImageSharp to provide plattform independency.

Quartz by: Marko Lahma Quartz.NET

Quartz Scheduling Framework for .NET

Quartz.Extensions.DependencyInjection by: Facundo Glaeser Marko Lahma Quartz.NET

Quartz.NET Microsoft.Extensions.DependencyInjection integration; Quartz Scheduling Framework for .NET

Quartz.Extensions.Hosting by: Andrew Lock Marko Lahma Quartz.NET

Quartz.NET Generic Host integration; Quartz Scheduling Framework for .NET

Quartz.Serialization.Json by: Marko Lahma Quartz.NET

Quartz.NET JSON Serialization Support; Quartz Scheduling Framework for .NET

QueryDesigner by: Vladislav Zhukov

QueryDesigner provides way of creating complex IQueryable filtering based on dynamic expression trees.

QuestPDF by: MarcinZiabek

QuestPDF is a modern library for PDF document generation. Its fluent C# API lets you design complex layouts with clean, readable code. Create invoices, reports, and documents using a flexible, component-based approach.

Quill.Delta by: blushingpenguin nozer

Converts Quill's Delta format to HTML/XHTML

RabbitMQ.Client by: Broadcom

The RabbitMQ .NET client is the official client library for C# (and, implicitly, other .NET languages)