rstudio
http://www.rstudio.com/
http://blog.rstudio.org/2015/04/28/rstudio-v0-99-preview-code-diagnostics/
https://jeffheaton.shinyapps.io/shiny/
https://www.kaggle.com/competitions
https://www.shinyapps.io/
http://www.rstudio.com/products/rstudio/download/preview/
http://toddwschneider.com/posts/traveling-salesman-with-simulated-annealing-r-and-shiny/#/
http://genius.com/Atodd-the-traveling-salesman-with-simulated-annealing-r-and-shiny-annotated