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 Draw a Dotted Line in GIMP. If you think creatively, you can often use existing tools in useful new ways. The free GNU Image Manipulation Program has a Paths tool that assists with drawing ...

Open your graphics project in GIMP. Create or select the text or object to which you would like to add the drop-shadow effect. Alternatively, you can use the selection tools to draw a marquee ...