Stores your links/bookmarks hierarchically on the cloud. It uses the exact same user interface on every browser.
With browser extensions for Chrome, Firefox and Edge, all your links are available on every browser tab, with added capabilities:
Import your browser bookmarks into links.
Add the current tab page as a link with a single click, including the page icon.
Each user gets its own private space where the links are stored. I mostly created this for myself, but anyone is welcome to use it.
You can find more information here: about links.