OD Gridify arranges all selected items on a grid.

Options:

• Columns: Defines the number of columns. Best fit is automatically computed to arrange in a square pattern
• Distance Between Columns: Defines the distance between each. It should be set at a minimum a bit larger than the bounding box of the largest item.
• Distribute on Axis: The axis the grid is created on.

Here's a how-to video showing OD Gridify in action.