Move -The Move tool allows an easier alternative to moving an objects X,Y,Z rather than through it's properties.
Rotate -The Rotate tool lets you rotate an object rather than using the rotation X,Y,Z in the properties. .
Scale -The Scale tool lets you scale an object's scale X,Y,Z.
Vertex -The Vertex tool allows you to edit a Mesh's polygon.
Copy -The Copy tool allows you to duplicate a objects an alternate to the copy option below the properties area.
Smart Copy -The Smart Copy tool allows you to not only just copy but copy a certain amount of objects you want by clicking on one of the arrows and the Shift key, a menu should appear and you can enter the amount of copies you want.