Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Artboard Studio - Online graphic design app mainly focused on product mockups.
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.
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.
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.
Image to Sketch - Convert images to pencil sketches with AI technology