Top 20 NuGet bus Packages

Pub/Sub in-memory with all parts configurable
This package works with Service Bus 1.1 for Windows Server. it adds Microsoft.ServiceBus.dll along with related configuration files to your project. Please note that this package requires .Net Framework 4 Full Profile.
This is the Azure Relay .NET Standard client library for Hybrid Connections. For more information about Relay see https://azure.microsoft.com/en-us/services/service-bus/. This package is only supported on Windows 8 / Windows Server 2012 and newer.
This library provides RabbitMQ implementations of the Solid Instruments messaging abstractions.
This library provides in-memory implementations of the Solid Instruments messaging abstractions.
This library provides Azure Service Bus implementations of the Solid Instruments messaging abstractions.
This library exposes abstractions for messaging constructs.
Provide core RabbitMq service bus functionality working with the cqrs.core
This library exposes the native .NET IoC integration for the Solid Instruments RabbitMQ messaging abstractions.
This library exposes the native .NET IoC integration for the Solid Instruments Azure Service Bus messaging abstractions.
This library exposes the native .NET IoC integration for the Solid Instruments messaging abstractions.
This library exposes the Autofac IoC integration for the Solid Instruments RabbitMQ messaging abstractions.
This library exposes the Autofac IoC integration for the Solid Instruments Azure Service Bus messaging abstractions.
This library exposes the Autofac IoC integration for the Solid Instruments messaging abstractions.
Task scheduling for .NET
Castle Windsor integration with Rhino.ServiceBus
Unity integration with Rhino.ServiceBus
MassTransit Message Bus Abstractions
Provides opt-in support for concurrency controls on Rebus message handling. This includes single access sagas (ie. only ony handler for a given saga running at a time) as well as more general handler throttling (ie. Throttling message through put based on types or properties)
A developer friendly service bus for .NET