Node JS, React Native
Node JS: Node.js is an open-source, cross-platform JavaScript run-time environment that executes JavaScript code outside of a browser. Typically, JavaScript is used primarily for client-side scripting, in which scripts written in JavaScript are embedded in a webpage's HTML and run client-side by a JavaScript engine in the user's web browser.
React Native: React Native is the native version of the popular JavaScript library – ReactJS, maintained by the developers at Facebook and Instagram. With over 2 years in existence, React Native has gained massive popularity amongst the developer community. So much so that it is now the fourteenth most starred project of all time on GitHub. Google trends show that the ‘React Native’ as a search term has been search more than ‘iOS development’ and ‘Android development’.