| Votes | By | Price | Discipline | Year Launched |
| 14445 | FREE | Interdisciplinary | 2011 |
Hypothesis is an open-source online annotation tool that allows users to highlight, annotate, and discuss web pages, PDFs and other digital content directly in the browser.
Founded around 2011 as a project to add a “peer-review layer” to the web, it is popular among researchers across the world.
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