PhoXo is a very lightweight, yet capable image editing application which is small enough to fit on a small disk and yet also able to run fine of lower-end systems like netbooks. It is a freeware image editing application that's well-designed and light on system resources.
Here are some screenshots to illustrate the features and user interface of this application:
Adobe Illustrator CC
Adobe Photoshop Elements
Chasys Draw IES
draw.io Desktop
PhotoPad