[DarrenDev]

DuckDuckGo are building new native browser apps for Mac and Linux. Not sure how far along they are, but I know they have teams working on each.

[MarcellusDrum]

It is for Mac and Windows, not for Linux. They also are using WebView/WebView2, so they aren't building an engine.

https://www.theverge.com/2021/12/21/22848133/duckduckgo-brow...

[Georgelemental]

Those are just wrappers around the platform WebView I think.