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

QRCoder by: Raffael Herrmann Shane Krueger

QRCoder is a simple library, 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.

QueryDesigner by: Vladislav Zhukov

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

RabbitMQ.Client by: Broadcom

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

RavenDB.Client by: RavenDB

RavenDB Client is the client library for accessing RavenDB

Rafty by: Tom Pallister

RAFT consensus implementation

prometheus-net by: andrasm qed- lakario sandersaares

.NET client library for the Prometheus monitoring and alerting system

RBush by: viceroypenguin

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

Quill.Delta by: blushingpenguin nozer

Converts Quill's Delta format to HTML/XHTML

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.

QRCoder.Core by: Afonso Dutra Nogueira Filho

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

PuppeteerSharp by: Darío Kondratiuk

Headless Browser .NET API

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

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

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.

Quartz by: Marko Lahma Quartz.NET

Quartz Scheduling Framework for .NET

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

Quartz.NET JSON Serialization Support; 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

Pragmastat by: Andrey Akinshin

Pragmatic Statistical Toolkit