Rank Country is a website that features datasets about education, healthcare, infrastructure, tourism, weather, and dozens of other topics. It is easy to browse the Rank Country data maps. Simply head to the site and open the "browse" menu in the upper, left corner of the page. That menu will reveal all of the data categories. Clicking on a category will reveal all of the datasets available within the category. Once you've selected a dataset it will appear on the map. Clicking on the map will reveal more information about the data as it relates to that location.
From my review of the sources that the Rank Country uses it appears that the bulk of the datasets come from The World Bank rankings. In some cases you'd be served just as well by heading directly to The World Bank's Open Data website.
One curious aspect of Rank Country that might be worth noting is that the site doesn't contain any information about who built it or owns it. I performed a WHOIS look-up on the site and found that it is registered to company called Lil Robots whose website refers to them as "multi-channel marketers."Applications for Education
I generally find sites like Rank Country to be useful in helping students make connections between the names of countries that they're reading about and where those countries actually are in the world. These kind of sites can also be helpful in starting discussions about regions and or groups of countries. Beyond the geography of the countries a site like Rank Country can be helpful in getting students to make comparisons of countries based upon a particular set of economic or social data parameters.