About 

The MaskBuddy is used to create 3D masks based on World Position, PRef or Normal data, for use in the mask inputs of other nodes. It has a built in preview feature, to help you place your masks easier, and natively supports up to 6 unique mask shapes within one tool

You can read the full documentation for the MaskBuddy here

 Features 

Generate multiple masks shapes with one tool, and have them interact with each other to create more complex masks

Press and hold Ctrl+Alt while using the Center sampler on the preview image, to you place the masks quickly

The preview image doesn't affect the render result as long as you are using the resulting masks alpha channel 

 Change the type of 3D shape to suit your needs. Spheres, cubes, tori, ramps, and more are possible

 The Buddy System 

This is a suite of tools I've been working on, which is designed to help compositors of all skill levels accomplish fundamental tasks, quickly and intuitively

If you'd like to learn about the other Buddy System tools you can find them here, and feel free to reach out if there are any issues, or if you have ideas to improve them!