Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Oracle Mobile Application - Oracle Mobile Application framework or Oracle Mobile Application development platform is a hybrid mobile framework for rapidly developing single source applications for many platforms and devices.
BuildFire - BuildFire is the easiest way for small businesses to build a mobile app in a matter of minutes for iOS and Android.
appdeck - AppDeck is a hybrid app building engine that allows the mobile app developers to create premiums mobile applications.
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.
AppGyver Composer - Visual enterprise-grade low code mobile app builder