Having installed Ghostery Dawn they included a number of Search Engines I was totally unaware of, so may as well list them for anyone to try out:
https://www.onesearch.com/ - aimed at privacy & encryption - operated by Yahoo and most likely using Bing as the back end, as Yahoo signed a deal with Microsoft.
https://www.ecosia.org/ - aimed at offsetting the energy used for searching by planting trees, based in Germany - results from Bing, Yahoo! & Wikipedia
https://www.ekoru.org/ - another Eco conscious search engine, this time profits go to cleaning up the oceans. Based in Malaysia. Not sure of back end technologies, but looks Googley from their results
https://www.qwant.com/ - A French search engine with privacy & sustainability in mind. Originally used Bing as the back end but now they're not telling, but they keep signing Microsoft deals so likely to be Bing + their own algorithms.
There is a fifth within the browser, Gibiru, but they have no information about who they are on their website so I've not linked to it.
Take from those what you will. Qwant appears to have a bit of investment behind them, they also offer Maps and a child friendly option so a bit more serious than the other players.
I've mainly tried Ecosia, Ekoru DDU & Bing but unfortunately in all cases found myself going back to Google for technical searches. They sadly still produce the best results for me
Likewise, I am trying to come off Gmail and planning that at some point either late this year or early next.