Kodular - Much more than a modern app creator without coding
Quick Code - Curated list of free online programming courses
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Py - Learn to code on the go 📱
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.
Mimo - Learn how to code on your iPhone📱