Ionic Framework is a complete open-source SDK for hybrid mobile app development. Built on top of Angular.js and Apache Cordova, Ionic provides tools and services for developing hybrid mobile apps using Web technologies like CSS, HTML5, and Sass. Apps can be built with these Web technologies and then distributed through native app stores to be installed on devices by leveraging Cordova.
Ionic Framework is a 100% free and open source project, licensed under MIT. It will always remain free to use, powered by a massive worldwide community. They have over 120 native device features like Bluetooth, HealthKit, Finger Print Auth, and more with Cordova/PhoneGap plugins and TypeScript extensions.
You can use their CLI to create, build, test, and deploy your Ionic apps onto any platform. The framework has Ionicons icon pack with hundreds of the most common app icons.
MIT licensed, and ready out of the box. And you can develop your apps by Live Reload because to compile and redeploy your app at every step of development is for chumps. And there are more useful features like deep linking, AoT Compiling, Ionic Native.