AppConvertly.com - AppConvertly - convert your website to Android & iOS app. No coding required. Easy solution to reach new audience in 5 minutes https://www.appconvertly.com/
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
Create - CREATE is a powerful and intuitive mobile creativity tool.
Bubble.io - Building tech is slow and expensive. Bubble is the most powerful no-code platform for creating digital products.
BuildFire - BuildFire is the easiest way for small businesses to build a mobile app in a matter of minutes for iOS and Android.
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.