Base Deploy - Build powerful apps faster - without coding
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Fluid - Turn Your Favorite Web Apps into Real Mac Apps.
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.
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.
TsterApp - Wireframe, mockup and prototyping on your iPhone.