Sketch This - Daily drawing challenges
SketchDaily.io - Free educational tool for improving your sketching skills.
ChalkMotion - Create animated doodle slideshows
Kakita Pencil Sketch - Sketch Photo – Kakita Pencil Sketch is an all-in-one photo editor that makes you an artist by letting you create the pencil art of your images.
Cycloid Drawing Machine - A mesmerising spirograph-like web app
Drawzee - Change your sketches into cats 🐱, dogs 🐶 or other animals 🐍