GIMP | 🗖 nosplit | ↑ parent "Image editor" | 43
It's not super easy to use. And it sometimes says that the basic drawing thing you want to do is off their scope. But hey, the UI looks good.
Examples:
- https://superuser.com/questions/167873/how-do-i-draw-a-box-in-gimp you need to go on a top menu to draw a rectangle