What are some alternatives?
When comparing appenguin and PhoneGap, you can also consider the following products
Thunkable - Powerful but easy to use, drag-and-drop mobile app builder.
GoNative.io - Convert your existing web application into native Android and iOS
React Native - A framework for building native apps with React
MIT App Inventor - MIT App Inventor | Explore MIT App Inventor
Bootstrap - Simple and flexible HTML, CSS, and JS for popular UI components and interactions