Top 20 NuGet background Packages

Abp.HangFire
The way the Xamarin.Forms Background Customization in Xamarin.Forms should be
StructureMap IoC container support for Hangfire. Supports both .NET Framework and .NET Standard.
ACR Background Jobs Plugin Autofac Extensions
LiteDB storage implementation for Hangfire (background job system for ASP.NET applications).
bootstrap your background task for .net core applications
Abp.Quartz
Easy way to run background worker with various mode
Long Running Process Execution in Dotnet. Runs long running processes in the background of your application allowing you to fire and forget any long running processes you may need to execute. The core elements that make Microphobia work.
Minion, background job system for .NET applications.
ACR Background Jobs Plugin Autofac Extensions
Lamar IoC container support for Hangfire. Supports both .NET Framework and .NET Standard.
Task scheduling for .NET: Azure Service Bus
Task scheduling for .NET
Cimbalino Toolkit is a set of useful and powerful items that will help you build your Windows applications. This is the PCL portion of the toolkit, which is also compatible with Background Agents.
Core components for Minion, background job system for .NET applications.
A simple mailer that renders Razor views for .NET Core
Entity Framework Core database provider for Scullery, a simple background job processor for .NET Core
Lightweight job runner for ASP.NET Core.
Chroniton is a light-weight, fully customizable, fully integrable, strongly typed, and open source solution for scheduling Tasks.