Derik Badman has links to some Search Plugins that we don't have. And some that we do. I'm not sure how he did these

Search for search plugins.

Here you can find a Search plugin which you can add to the search box in your browser.
You can search by name (or url), by category, by country or by language and also by any combination of the above.

PennLabs presents new software developed by the Penn Library - and, in some cases, still under development. Please try these web tools and send your feedback to us at library@pobox.upenn.edu.

Here is a search plugin for the subscription version of the OED. I'm not sure if it works from outside of the University, but with conquery, it's super powerful.

PennLabs --  software developed by the Penn Library

Biomed Central Search plugin with links to other biomed search plugins

A search plugin for GoogleScholar from UNC. I wonder if it's proxied. That would be cool. What about the toolbar, though? Hmm.