The SVG format is ideal for customers who don’t want to use Adobe Illustrator. The SVG files are compatible with any software that can read SVG 1.1 files (Scalable Vector Graphics).
Inkscape, which is free, is worth trying.
You can also download a free trial of CorelDraw from the Corel website, which offers advanced editing options.
The SVG files can be manipulated to varying degrees, e.g. colour changes, scaling, plotting extra places, deleting unwanted data, with such software.