Blender Addon that adds the ability to name and save render borders/regions for cameras.

Adds a panel in Properties window Output tab that lets you save, set, and delete render borders.

Works on Windows, Mac, and Linux.
Meant for Blender 2.8 Beta

Download the python file (put it in a place where you can easily find it, like your desktop)
In Blender's settings, go to the addons tab
At the bottom, click "Install from File"
Find where you put the python file, select it, and click "Install from File"

Create a render border in a camera view.

Go to Properties window > Output tab > Saved Render Borders

Inside the Saved Render Borders section is a list of all saved render borders in this scene.

Click Save to save the current render border and give it a name.
Click Set to set the selected render border as active.
Click Remove to delete the selected render border.

Only saves render borders for cameras.