Documentation Module and Handler, DocMAH, is a full-service documentation tool for .NET web applications. DocMAH integrates directly with your application so that you can create both page-level help popups that can be toggled on or off and comprehensive, CHM-like documentation pages. Not only is DocMAH easy to setup and use, but it can also be customized to fit your branding or preferences.
$ dotnet add package DocMAHNo README available.