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.

Pragmastat by: Andrey Akinshin

Pragmatic Statistical Toolkit

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

Protobuf.Text by: Kerry Jiang and other contributors

Text format support for google's protobuf C# library

QRCoder by: Raffael Herrmann Shane Krueger

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

RabbitMQ.Client by: Broadcom

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

Radzen.Blazor by: Radzen Ltd.

Radzen Blazor is the most sophisticated free UI component library for Blazor, featuring 110+ native components including DataGrid, Scheduler, Charts, and advanced theming with full support for Material Design and Fluent UI.

Razorvine.Pickle by: Irmen de Jong

A feature complete pickle protocol implementation (Python's builtin serialization mechanism)

RBush by: viceroypenguin

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

RBush.Signed by: viceroypenguin

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

ReactiveUI by: .NET Foundation and Contributors

A MVVM framework that integrates with the Reactive Extensions for .NET to create elegant, testable User Interfaces that run on any mobile or desktop platform. This is the base package with the base platform implementations

ReactiveUI.Core by: .NET Foundation and Contributors

Type-agnostic core shared by ReactiveUI and ReactiveUI.Reactive.

ReactiveUI.Disposables by: ReactiveUI Association Inc

High-performance reactive primitives for building allocation-conscious ReactiveUI and Rx-style .NET applications without a production dependency on System.Reactive or R3.

ReactiveUI.Fody by: .NET Foundation and Contributors

Fody extension to generate RaisePropertyChange notifications for properties and ObservableAsPropertyHelper properties.

ReactiveUI.Primitives by: ReactiveUI Association Inc

High-performance reactive primitives for building allocation-conscious ReactiveUI and Rx-style .NET applications without a production dependency on System.Reactive or R3.

ReactiveUI.Primitives.Core by: ReactiveUI Association Inc

Type-agnostic core primitives shared by ReactiveUI.Primitives and ReactiveUI.Primitives.Reactive.

RedLock.net by: Sam Cook

An implementation of the Redlock distributed lock algorithm

refit by: Paul Betts Refit contributors

The automatic type-safe REST library for Xamarin and .NET

Refit by: ReactiveUI and Contributors

Type-safe REST API clients for .NET, generated from annotated interfaces with build-time source generation, direct request construction, System.Text.Json defaults, and support for trimming and AOT.

ReflectionBridge by: Stef Heyenrath

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