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.
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Clip Studio Paint - The artist's software for drawing and painting.
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.
MyPaint - MyPaint is a fast, distraction-free, and easy painting tool for digital artists.
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.