Hypothesis

Hypothesis is a general-purpose web annotation platform that enables users to annotate any text on the Internet, including HTML, EPUBs, text/CSV files, and online or downloaded PDFs. Users can highlight text, add their comments and post those publicly, privately, or in the context of private or public groups. They can also reply to or share annotations, each of which is available at a unique URL. Hypothesis is centrally hosted, offers a robust API, and integrates with most popular publishing and educational systems and can be added to any website with a single line of JavaScript.

Basic Info:

Institutional host: Hypothesis Project (nonprofit)
URL: https://web.hypothes.is/
Principal investigator: Dan Whaley
Contact: https://web.hypothes.is/contact/
Lead developer: Lyza Danger Gardner; Sean Hammond; Robert Knight; Hannah Stepanek
Funding sources: Helmsley, Knight, Mellon, Omidyar, Shuttleworth, Sloan, Schmidt Futures, MDPI.
Development partners:
Partners: AAAS; Cambridge University Press; The Johns Hopkins University Press; Michigan Publshing; NYU, OJS, eLife, and many more https://web.hypothes.is/partners/
Initial release: 2011
Version (as of June 2019): 1.161 (browser app)

Github (as of April 2019):

URL: https://github.com/hypothesis/h
Language: Python
License: BSD
Last commit: 2019-04-17
Contributors: 54