React is a JavaScript library for building user interfaces. It's declarative, efficient, and extremely flexible. What's more, it works with the libraries and frameworks that you already know. http://facebook.github.io/react/
JavaScript URL routing for ASP.NET MVC. Allows you to use your ASP.NET MVC routes from JavaScript. Please refer to project site (http://dan.cx/projects/routejs) for more details, usage examples and sample code.
Determine the country, region, city, latitude, and longitude associated with IP addresses worldwide. Uses the MaxMind GeoIP or GeoLite City or GeoLite Country (free) database which needs to be downloaded separately from http://www.maxmind.com/app/geolite