When comparing Zazu vs GNOME Do, the Slant community recommends GNOME Do for most people. In the question“What are the best app launchers for UNIX-like systems?” GNOME Do is ranked 19th while Zazu is ranked 28th. The most important reason people chose GNOME Do is:
By using the many available plugins Gnome Do can become a powerhouse of combined tools in one easily launchable and usable application.
Ranked in these QuestionsQuestion Ranking
Pros
Pro It looks pretty
Pro Extensible
List of plugins: http://zazuapp.org/plugins/
Pro Free & open source
Pro File system search
Pro Look/feel like macOS's Spotlight
Pro Clipboard history
Pro Plenty of plugins
By using the many available plugins Gnome Do can become a powerhouse of combined tools in one easily launchable and usable application.
Pro Themeable
Users can easily customize the looks of Gnome DO with the available themes in the settings of the app..
Cons
Con Finicky json config file without decent documentation on the process.
Con Tiny library of plugins
Con Inactive development
Con Has not been updated in a while
With the last update being dated Jan. 2014 development seems to be at a standstill.