For me Synapse uses DuckDuckGo as its search engine, and I don't see a place to change it. Perhaps it uses the search engine of your default browser. What is your default browser?

In general, this is a good resource for finding alternatives to a program. https://alternativeto.net/software/synapse-launcher/?license=opensource

If you have JavaScript disabled (which I advise) you won't be able to filter by license from within the page. Instead just append '?license=opensource' to the URL.

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