Pundit is a cloud service that allows users to 'take notes' on web documents, like a web page or a PDF file. It consists of a set of components, amongst them the Annotator, a free extension for the Google Chrome browser used by users to create the annotations. Annotations can be highlights of text parts or comments, applied either on a selection of the text or on the whole document. It is also possible to create annotations to tag a selected text or an entire web page. Pundit supports semantic annotations, real RDF triples (subject - predicate -> object) to specify formal, structured and reusable statements associated to the annotated content.
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Pundit was used in this research abstract https://dh2016.adho.org/abstracts/363