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.

prometheus-net by: andrasm qed- lakario

.NET client for prometheus.io

protobuf-net by: Marc Gravell

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

protobuf-net.Core by: Marc Gravell

The protobuf-net serialization engine and build-time tooling; most projects should reference protobuf-net, which adds the runtime type model

PtgPdfCore.runtime.android by: patagames.com

Runtime native library assets for the Pdfium.Net SDK package (id:pdfium.net.sdk) - android-x64, android-x86, android-arm, android-arm64.

PtgPdfCore.runtime.linux by: patagames.com

Runtime native library assets for the Pdfium.Net SDK package (id:pdfium.net.sdk) - linux-x64, linux-x86, linux-arm, linux-arm64.

PtgPdfCore.runtime.linux-musl by: patagames.com

Runtime native library assets for the Pdfium.Net SDK package (id:pdfium.net.sdk) - linux-musl-x64, linux-musl-x86, linux-musl-arm, linux-musl-arm64.

PtgPdfCore.runtime.osx by: patagames.com

Runtime native library assets for the Pdfium.Net SDK package (id:pdfium.net.sdk) - universal binary x86_64, arm64.

PtgPdfCore.runtime.win by: patagames.com

Runtime native library assets for the Pdfium.Net SDK package (id:pdfium.net.sdk) - win-x64, win-x86.

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 Use System.Drawing.Common below 7.0.0.

Quartz by: Marko Lahma

Quartz.NET Scheduling Framework for .NET Platform

Quartz.Serialization.Json by: Marko Lahma

Quartz.NET JSON Serialization Support

QueryDesigner by: Vladislav Zhukov

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

QuestPDF by: MarcinZiabek

QuestPDF is a modern PDF generation library for C# and .NET. Create invoices, reports, and data exports — a code-first alternative to HTML-to-PDF conversion. Merge and edit documents, generate PDF/A and accessible PDF/UA files, embed ZUGFeRD and Factur-X invoice XML. Source-available with a free Community license.

Quill.Delta by: blushingpenguin nozer

Converts Quill's Delta format to HTML/XHTML

RabbitMQ.Client by: The RabbitMQ Team

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

RavenDB.Client by: Hibernating Rhinos

RavenDB Client is the client library for accessing RavenDB

ReflectionBridge by: Stef Heyenrath

Provides some extensions which define a bridge for the differences between Type and TypeInfo.