Whisker menu is described as 'Written by Graeme Gott, this plugin is a menu for Xfce that provides access to favorites, recently used, and searching installed applications' and is a Shell Extension in the os & utilities category. There are four alternatives to Whisker menu for Linux. The best Whisker menu alternative is Cardapio, which is both free and Open Source. Other great apps like Whisker menu are ClassicMenu Indicator, GnoMenu and mintMenu.
Cardapio is an application menu that can work in two modes: as a panel applet (in which case it is an alternative to Gnomes application menu applet) or as a stand-alone launcher (in which case it is an alternative to the simplest use-cases of Gnome Do).
ClassicMenu Indicator is a notification area applet (application indicator) for the top panel of Ubuntu’s Unity desktop environment. It provides a simple way to get a classic GNOME-style application menu for those who prefer this over the Unity dash menu.
A consolidated menu for gnome that brings eye candy to the world of the Gnome menus. Fully functional menu, supports themes, for a composited or non composited desktop. It can emulate the look and feel of the most beautiful menus of most modern desktops, and it can also use...
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It's a notification applet, not a menu, and it's for a different desktop environment