This may or may not be what you're looking for, but you should check out my company's product, Meta Search. Our website is https://www.meta.sc and our product provides a really powerful search experience across a bunch of different cloud platforms as well as local devices. Happy to answer any questions you may have!

What kind of metasearch?

For web metasearch, DuckDuckGo has taken the crown from Metacrawler, and is easily the best thing out there.

As for the rest... I don't know.

try http://searx.me/ it is open source, also available as a docker instance.

besides web interface it also offers RSS, CSV and JSON api. supports about 10 search engines.

you can query it in curl or write a simple api client with rest-client