Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
AppYourself App maker - App maker designed by AppYourself is a popular app builder platform that gives you the opportunity to create feature-rich Android, iOS, and PWAs apps in minutes.
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.
AppMySite - An automated no-code app builder
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.
AppyPie AppMakr - AppMakr is a browser-based platform designed to make creating your own iPhone app quick and easy.