You can now buy Divi child themes, layouts, and plugins in the official Divi marketplace * run by Elegant Themes.
A Divi Theme website example for adding watermarks to images @ My Watermark
"My Watermark: the most elegant way to put your name on your work"
This Divi Theme website uses the following plugins;
No plugin details for Divi Booster available
Dt Logo Slider
Woocommerce German Market
Divi Desktop Menu Customizer
Divi Mobile Menu Customizer
WP Super Cache