Ecosia

Kagi if you're willing to pay (to an American company) for really high quality search results, e.g. for deep technical or scientific work

Startpage gives a good search experience; it uses Google's index. I've read that they're owned by an ad company though, casting doubt on their privacy claims

Qwant is also liked by a decent number of people, but I think there are issues about the behavior of the company behind it