In Gnome2 there was a listing of applications installed. Since Gnome3 and Unity, you have to search for the application you want. You can use Run Command but you have to know the name of the app you want to open.
Are there any other ways to open applications besides Dash-Applications-Lens and Run Command?
menu
. Also, if it is compatible, look at the Axe Menu, as that provides a brilliant interface. – Wilf Nov 16 '13 at 12:50