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I don't know if those are the three most recent because I have no idea how to look that up but they're quite recent: MAPfrappe allows you to compare the outlines of different countries/cities/regions by projecting them onto Google Maps. You can even create your own outlines. Very useful to get a feeling of how a big certain region really is. Resemble.js basically like diff but for images. Lets you compare two images. Geacron an interactive map of how the world looked (politically) in a given year. Really useful!