PhoneGap

PhoneGap is the open source version of Apache Cordova, a mobile application development framework that allows developers to create mobile apps with HTML, CSS, and JavaScript. In a sense, this is very similar to Ionic in that you can use it to create a single codebase that can run in multiple platforms without any issue whatsoever. 

Apache Cordova (formerly PhoneGap) is a mobile application development framework created by Nitobi. Adobe Systems purchased Nitobi in 2011, rebranded it as PhoneGap, and later released an open-source version of the software called Apache Cordova.