Autify for Mobile - Autify for Mobile is a no-code testing platform.
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Waldo for Android - No-code mobile testing that works
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.
InVision Mobile Testing - New free, unlimited user testing for mobile prototypes
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.