Excalidraw - Excalidraw is a whiteboard tool that lets you easily sketch diagrams that have a hand-drawn feel to them.
Sketcharama - Draw a given word and let the other players guess your sketch.
Drawasaurus - Drawasaurus is an online drawing & guessing game you can play with friends or strangers.
Sketch Toy - A drawing application that lets you save and share replays of your work with friends.
QueekyPaint - QueekyPaint is a unique browser-based drawing tool for creating animated drawings online.
Sketch Swap - Draw 1 to get 1. . Draw cartoons, art, brainstorms, anything.