Soft Doodle allows you to draw free form and gives the finished shape a rounded look, like a cloud. This is great for drawing something like a star, which naturally uses sharp angles and straight lines. You can also make your own Paint 3D stickers from image files.
Any of them can be any color you wish, and each have their own options, like for choosing the line thickness and opacity. Lots of art tools: a marker, calligraphy pen, oil brush, watercolor brush, pencil, eraser, crayon, pixel pen, spray can, and fill tool.