Math Viz (Console) is a free addon that comes packaged with Blender. This addon has a pretty niche use-case when compared to the broader scope of Blender. It’s mostly for addon developers looking for aid in debugging but it’s worth taking a look at even if you’re not that interested in coding. The Math Viz Console addon mostly uses Blender’s Python console editor to make graphing points, lines, and matrices easier in the 3D View. It also creates a nice UI menu in the scene tab of the properties panel.