Try Codesandbox and Figma (both run in the browser) with your kids. Figma is really underrated as a general graphic design tool, the pen tool for vector shapes

Try Codesandbox and Figma (both run in the browser) with your kids. Figma is really underrated as a general graphic design tool, the pen tool for vector shapes is top notch, and you can use blend modes for images. Google fonts are already integrated, it can be used to learn e.g. logo design.