WordPress subdomain search widget plugin

I am wondering if you have ever run across a WordPress widget plugin that allows a visitor/user to search your multisite for a specific subdomain?

I have a multisite install where the main site only needs to be a search portal for all of the subdomains. The home page is just a theme without any content. I would like to use a widget or a possibly a page template with a search box in it. Seen anything like the attached image? Do you know how to make something like it?

Thanks! :slight_smile: