Greenwich is a free Chrome add-on designed to enrich the web browsing experience by allowing users to suggest related links for any webpage. This tool facilitates collective contextualization, where users can contribute and view suggestions made by others, enhancing the relevance of the information presented on the page.

The unique feature of Greenwich is its ability to display suggestions as superscripts next to relevant sentences. Users can click on these superscripts to access the related links, promoting a collaborative approach to online research and discovery. This functionality not only helps in finding additional resources but also connects users through shared knowledge and insights.