I use dmenu: https://tools.suckless.org/dmenu/

KDE's Krunner does a good enough job and is integrated pretty well with the plasma desktop.

I use Rofi. https://github.com/davatorium/rofi

I use synapse[0], although I'm not sure if it has all the same features. I think it can do things like search the web, but I pretty much only use it to search/launch programs, and occasionally some files.

[0] https://launchpad.net/synapse-project

Ulauncher: https://ulauncher.io/

Albert, maybe?

https://albertlauncher.github.io/

gnome-shell