Appcelerator Titanium - Appcelerator Open Source
Android Studio - Android development environment based on IntelliJ IDEA
React Native - A framework for building native apps with React
Flutter.dev - Build beautiful native apps in record time 🚀
Onsen UI - HTML5 Hybrid Mobile App UI Framework - work with Angular, React, Vue, Meteor & pure JavaScript. Material & Flat design.
ASP.NET Core - With ASP.