GridaPic

An application which helps with your sketching

grid over people

grid over landscape

Instantly place a grid over a reference image.
Display an image at full screen or against different background colours.
Enlarge portions of an image.
Capture and save the image part of the screen easily

GridaPic is freeware. Both Mac and Windows versions are available. To see more information click here. Go to the download page to choose your version.