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I was interested for a few seconds, until I saw that it's a SaaS.

Sorry, but that's a no-go at this point.

Fair :) We do have open-source pieces (Unlayer Elements, React Email Editor, AI Skills), but the hosted builder itself is commercial.

Just went through open-source pieces. Looking good.

Just provide a downloadable version. Your server side should be just a glorified templating engine and a DB from consumers' point of view.

Charge for the local version, of course.