Google Charts provides free and open JavaScript classes that *very greatly* ease the use of D3 for a wide range of visualization types. There are currently 29 types of visualizations available at the time of this post.
There is in-depth documentation for each visualization type and many of the examples can be easily modified using a simple text editor. A strong use case for using this resource, as opposed to a full-blown visualization application such as Tableau is the ability to programmatically generate the visualizations within larger Python scripts or Notebooks, or R scripts.
Here are a couple of quick visualization examples we created using Google Charts:
Sankey Diagram showing relationships between scholarship in Scopus.
Gantt Chart outlining a project’s task list. I appreciate being able to easily visualize dependencies between tasks.