To make dotted lines or circles and shapes with dotted lines using GIMP, use the Paths tool to draw the line & then the Stroke path tool.

How to Erase Lines From a Picture in OpenOffice Draw. The OpenOffice Draw application has drawing tools that you can use to quickly add lines, shapes and other objects to a business document. With ...

If you are just starting out, or if you've been hiding behind your computer's ability to consistently draw straight lines, then this hack is for you.