@schratze I'm not actively using it for general search so not necessarily a recommendation, but: https://searchlab.eu/ is built on YaCy, which is a decentralized search engine with a P2P protocol, building a shared index.
The UI is not as polished as gg or DDG but you can choose different interfaces - you can even have your results as raw JSON if you like ;)
https://searchlab.eu/en/apps/data_studio/