appenguin - Turn the most complex web application or website to into an Android app in minutes, for free!
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
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/
BuildFire - BuildFire is the easiest way for small businesses to build a mobile app in a matter of minutes for iOS and Android.
WordPress To App - We convert your WordPress website into a native mobile app for Android and iOS. Supports all android & iOS versions.
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.