The guys at RStudio are simply awesome! I will tell you 'why' in a minute.
I was recently browsing for a package to create maps without coding in JavaScript. I tried using googleVis, rMaps, LeafletR, and a lot of other packages that output map-images, until I came across this package called Leaflet. My favorite feature from the package- compatibility with RMarkdown- produces a great experience of seamless zoomable, interactive maps in an HTML which is quite portable.
I get scared just writing HTML, JavaScript for me right now is far-far away! And then there was this package which now does not need me to leave my comfort zone (R-Rstudio) but still produces pretty-lookin' maps!
Here is the project on Github: https://github.com/rstudio/leaflet
I am thankful to their blog for a lot of code which appears on this page: http://rstudio.github.io/leaflet/#installation-and-use
This repo is basically my attempts to create maps in by doing comfortable coding in R and minimal coding in JavaScript with the use of this great JS library called Leaflet.js
The markdown committed to this repo (.Rmd) file is by all means tweak-able and I will be more than happy to answer any questions as long as I can answer them!
Thanks for visiting this page.
-Sarang