Modify > Align Tool

Lets you align objects visually by clicking icons representing the planes and positions you want to align.

Select the objects you want to align. The other objects align to the last selected (green) object.

• Click an icon to align the objects. The icons show how the bounding boxes align. For example:
  
• Use Edit > Undo or press z to reverse an align.

In the following example, the objects align to the far right of the cube outside the transparent box.