Mate and Gnome Session Fallback desktop environments are almost alike and really lightweight and it is the most preferred desktop environment for me.
Only thing I miss is some way to search installed applications quickly as we do using Unity-Dash. Since going through the Application menu and looking for the long list of installed application takes a long time. Some time it is so difficult to find an application. For example looking for PCManFM file manager, you guys know what I'm talking about. :)
Is there any Application Finder which can be installed in Mate and/or Gnome Session Fallback to search installed application quickly?