Shiny, and I love the interface/layout!<p>This looks a lot like the Jupyter/IPython Notebook, which is a free and open source "scientist's notebook". If you're interested in mixing LaTeX, Markdown, and code from almost any language (Python, R, and Julia are very well-supported but there's an open kernel spec), then this might be a more appropriate tool for you to use.<p>The Jupyter/IPython notebook default storage format is JSON, which makes it a little more friendly for text-based version control, and also enables a static HTML view of notebooks (<a href="http://nbviewer.jupyter.org/github/ketch/teaching-numerics-with-notebooks/blob/master/Introducing%20the%20IPython%20Notebook.ipynb" rel="nofollow">http://nbviewer.jupyter.org/github/ketch/teaching-numerics-w...</a>) on GitHub.<p>Helen Shen wrote up a great article for Nature (<a href="http://www.nature.com/news/interactive-notebooks-sharing-the-code-1.16261" rel="nofollow">http://www.nature.com/news/interactive-notebooks-sharing-the...</a>) on how scientists are using the notebook, but it also provides a good overview of how you might use it, as well as a free interactive demo.