Is there an alternative to "Everything" on OS X? Spotlight does pretty much, but it lacks two critical features.


It cannot search arbitrary locations. It excludes system locations for a better user experience I guess.
It cannot index external drives.


For example I often search the ID of a chrome extension to get to its folder. That's way faster than typing the path. Unfortunately, I do not know how to do this on OS X

Is there an alternative on OS X that includes the features of Everything?
In your case probably the 


  mdfind


will do great job.

It is not a GUI but a Terminal command, and it will search everywhere and everything.

Once found you can triple click on the line (to select it) and Right Click and use the "Reveal in Finder".