Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.
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.
Clip Studio Paint - The artist's software for drawing and painting.
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.