A new Chat Resource Center has been launched, offering overviews, tutorials, and design patterns for building mobile and web chat applications. The article discusses the development of a scalable JavaScript group chat app called PubNub Messenger, designed to address common issues like connectivity and feature limitations in messaging applications. The project, which runs on Android, iOS, and Desktop, utilizes jQuery Mobile for the frontend and the PubNub API for real-time messaging, eliminating the need for a complex backend. The process involves building a simple chat room, managing multiple rooms with message history, and creating mobile apps through PhoneGap, which allows the app to run across multiple devices effortlessly. The final application consists of a minimal setup with HTML, JavaScript, and CSS files, demonstrating the ease and efficiency of modern web development practices. Users interested in creating similar applications can access the source code on GitHub and utilize PubNub to facilitate real-time chat functionality.