Looking for a hovercard plugin

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I was browsing around on WordPress.org and saw this. I thought it would be great for a website I’m building, since it uses a lot of terminology that people don’t necessarily know. Part of the site is a glossary but this would be even better. What’s a good plugin that will let me do this (or even link the card contents to an anchor or something in the current glossary)?

It looks like this particular one might be an in-house plugin.