JupyterLab is “a highly extensible, feature-rich notebook authoring application and editing environment.” Most courses on DataHub use JupyterLab as the primary user-facing application.
Figure 1:Screenshot of JupyterLab.
JupyterLab supports many different programming languages such as Python, R, and Julia. The languages are made available through kernels. The main hub has both Python and R kernels while, Julia is available on Julia Hub.
Besides the built-in features, there are numerous extensions that can be used to augment its features.