BitBucket NBviewer Button is a Chrome extension developed by OlympusMonds. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This free program aims to enhance the viewing experience of IPython/Jupyter notebooks on BitBucket.

Committing IPython/Jupyter notebooks is a useful practice, but when it comes to reviewing changes in these notebooks, it can be challenging due to their JSON format. The BitBucket NBviewer Button solves this problem by adding a button in BitBucket that links to NBviewer. When the button is clicked, NBviewer reads the raw commit and renders it, making it much easier to review the changes made to the notebook.

It is important to note that this extension is designed to work only with public repositories. With its simple and straightforward functionality, BitBucket NBviewer Button provides a convenient solution for developers using BitBucket to collaborate on IPython/Jupyter notebooks.