CodePen - A front end web development playground.
Image to Sketch - Convert images to pencil sketches with AI technology
JSFiddle - Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor.
Artboard Studio - Online graphic design app mainly focused on product mockups.
JS Bin - Sample of the bin:
Canva - Canva is a graphic-design platform with a drag-and-drop interface to create print or visual content while providing templates, images, and fonts. Canva makes graphic design more straightforward and accessible regardless of skill level.