MapChat

MapChat: A super simple location based chat in about 400 lines of code  

Features:
- Super simple location based chat.
- No registration or message history.
- Built-in Google Translate widget.
- Create a private chat map by adding #name to the url.

This demo app is hosted on GitHub pages and uses a Vert.x SockJS server deployed on a single core Azure machine. This tiny lightweight Vert.x server served hundreds of concurrent users and could be scaled horizontally with very minimal effort. The whole app runs on a 0$ budget, with the server running on the free tier azure instance and the static content being hosted and served from GitHub Pages.