Top 20 NuGet alert Packages

Notify user when a new version of your app is available.
OXOX Design Modal
This app will alert you if a value on an incoming event does not match the predefined whitelist
A Razor Class Library that provides a means to display Flash Messages in an ASP.NET web application. (Razor Pages and MVC are supported.) It depends on and utilizes Twitter Bootstrap 5 for the alert CSS and HTML.
Toast alert notification for desktop