To be fair, even DuckDuckGo is closed-source. The only fully open-source search engines I know of are wiby.me and YaCy.

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There is https://html.duckduckgo.com and they have onion addresses as well, which is a good solution for the client-side but of course the engine itself is not free. Just heard about stract from this thread, there is also https://metager.org/