Hypothes.is

 Hypothes.is  is a centralized service and open-source project for annotation and highlights on the web.

History
Hypothes.is is a 501(c) open-source software project. A Kickstarter drive to raise $100,000 to fund a working prototype narrowly reached its goal on November 13, 2011.The effort is organized as a non-profit. It has received financial support from the Shuttleworth Foundation,[13] the Alfred P. Sloan Foundation,the Helmsley Trust, the Knight Foundation, and the Andrew W. Mellon Foundation.

Hypothes.is uses the the Web Annotation Data model recommended by the now closed W3C Annotation Working group and overseen by a W3c Community Group

The tool relies on JSON-LD and a vocabulary based on RDF.

IndieWeb Examples

 * PESOSs his annotations back to his website manually
 * In late 2019, he switched over to using an RSS feed into a webhook to publish them to his Micropub endpoint. Details: https://boffosocko.com/2020/01/21/using-ifttt-to-syndicate-pesos-content-from-social-services-to-wordpress-using-micropub/


 * uses the html export tool to PESOS his annotations to his website. He has experimented with using unmung to convert the RSS feed of his his annotations to an h-feed]


 * uses the javascript plugin on his Known site Stream


 * Spencer Greenhalgh is using Hypothes.is as a commenting system for his Hugo-based website as of 2022-06-16

Other Examples

 * Remi Kalir uses the javascript plugin on his WordPress site to allow users to annotate.

How to

 * Export data: https://web.hypothes.is/help/how-do-i-export-my-annotations/
 * Annotation export export annotations as HTML, JSON, and CSV

Plugins and Tools

 * IFTT to create a user dashboard using the Hypothes.is API


 * Facet viewer


 * WordPress Plugin


 * CROWDLAAERS ​Capturing and Reporting Open Web Data for Learning Analytics, Annotation, and Education Researchers (CROWDLAAERS, pronounced "crowd layers") provides learning analytics about active participants, temporal activity (active days), collaborative discourse (threads), and also Hypothesis tags. Groups of individual annotations may be sorted by date, contributor, annotation, tags, and level (or the position of an annotation reply in a thread). Select any annotation to read the full content within CROWDLAAERS or in context of the source document


 * DocDrop a tool for refingerprinting .pdf files and for viewing a UI for annotating the transcripts of YouTube documents

Criticism
Some believe the use of RDFa in the annotation standard creates an over complicated spec for annotation