-
TextAnnotationGraphs
A modular annotation system that supports complex, interactive annotation graphs embedded on top of sequences of text.
-
SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
There's a fair amount of work intended to visualise sentences. The Reed-Kellog system is the most popularly used in pedagogy (though I personally find them a bit unintuitive). There are definitely shinier, more modern ways you can use to display grammatical relationships. For example, I'm not sure whether people have tried using them in pedagogy, but if you're familiar with dependency grammar, you can look into things like displaCy for Universal Dependencies graphs or Text Annotation Graphs.