Unfurl
Those handy little previews you see when you paste a link into a Slack message are what we refer to as unfurling internally at Slack (and also in Slack’s API documentation). While it may sound like a made up bit of tech jargon, it’s an actual word that means “to spread out from a rolled or folded state” which is what Slack attempts whenever it encounters a link.
https://github.com/oscarotero/Embed/
https://packagist.org/packages/embed/embed
https://github.com/mpratt/Embera
https://www.openhub.net/p/essence-extract