The everything search engine is flexible and fully indexed file search engine that you can use to find any file anywhere on your network or local storage, instantly, and only a little bit slower than instantly on a very slow old machine.
It's what Windows search could have been. I don't know what kind of black magic they've got under the hood there but I think it's really just indexing and watching the file system for changes so that it can update the index in real time. This obviously doesn't work for a network resources that change frequently but still, it's very nice when you don't know where the hell anything is.
Everything is still far superior than plasma search and I can't imagine that gnome/other DEs get close to it neither. Fsearch is close but it needs to do a complete resacn every time you use it instead of scanning in the background like everything