PdfPig by: UglyToad

Reads text content from PDF documents and supports document creation. Apache 2.0 licensed.

PDFsharp by: PDFsharp Team

PDFsharp is the Open Source library for creating and modifying PDF documents using .NET. It has an easy-to-use API that allows developers to generate or modify PDF files programmatically. PDFsharp can be used for various applications, including creating reports, invoices, and other types of documents. This package does not depend on Windows and can be used on any .NET compatible platform including Linux and macOS. See https://docs.pdfsharp.net for details.

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.

PInvoke.Windows.Core by: Andrew Arnott

P/Invoke types for common Windows APIs.

PolyType by: Eirik Tsarpalis

Practical generic programming for C#

Portable.BouncyCastle by: Claire Novotny

BouncyCastle portable version with support for .NET 4, .NET Standard 2.0

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.System.DateTimeOnly by: Oleg Rakhmatulin

DateOnly and TimeOnly types for .NET versions before 6.0

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

PusherServer by: Pusher

Pusher .NET library for interacting with the HTTP API

QRCoder by: Raffael Herrmann, Shane Krueger

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

Quartz by: Marko Lahma, Quartz.NET

Quartz Scheduling Framework for .NET

Quartz.AspNetCore by: Lewis Zou, Marko Lahma, Quartz.NET

Quartz.NET ASP.NET Core integration; 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

RBush by: viceroypenguin

Spatial Index data structure; used to make it easier to find data points on a two dimensional plane.