miniPaint - Online graphics editing tool use HTML5 technologies like Canvas, Offline support, Drag and Drop.
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
RealWorld Paint - RealWorld Paint is an free portable image/photo/animation editor.
MIT App Inventor - App Inventor is a cloud-based tool, which means you can create apps for phones or tablets right in your web browser.
Paint XP for Windows 7 - Standalone old MS Paint program that allows you to get your old XP Paint interface in Windows 7.
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.