Recently I have been playing with the R application, Shiny. Shiny offers a way to embed R applications on the web.
Here is a toy model I developed to illustrate the interaction between portfolio weights and contributions to portfolio risk. Access the app here: Visualize Portfolio Risk.
This is a slightly less elaborate version of my project in the Coursera course, Developing Data Products, the ninth of ten courses I took as part of the Johns Hopkins University Data Science certification.