I've tried a couple, but I always end up back to Alt+F2 in XFCE, since most of these launchers always start so slowly in comparison, and I never use any other features (more than once) than starting Firefox/Emacs/Terminal …
+1, it's the fastest of all that I've tried. It doesn't do too much out of the box, but it takes a couple frames to launch, as opposed to >1s for many of the alternatives.
* Ulauncher http://ulauncher.io/
* Albert https://github.com/albertlauncher/albert#albert-
* Synapse https://launchpad.net/synapse-project
* Kupfer https://kupferlauncher.github.io/
* Zazu http://zazuapp.org/
* M-x counsel-linux-app http://oremacs.com/2016/03/16/counsel-linux-app/
I've tried a couple, but I always end up back to Alt+F2 in XFCE, since most of these launchers always start so slowly in comparison, and I never use any other features (more than once) than starting Firefox/Emacs/Terminal …