What is the most user friendly projection mapping software? I'm setting up a projection map for a non-profit that will have images projected onto angular and unusually shaped walls. I use modul8 on my mac in the past, but this case is different. They use PC (in fact their whole show runs off of a laptop) and they want the ability to change the images based on the theme of the show. They have an A/V guy, but I don't want to suggest complex software that is going to be hard for a beginner to use. What software should I recommend and then use to set up their show so they don't have to keep calling little old expensive me?

EDIT: I should also mention that this is a small non-profit, so free or really cheap would benefit them greatly.
I'd hate to answer my own question, but just wanted to share what I found in case anyone else is interested.

PaintingWithLight has a feature rich demo that is very beginner friendly, and only costs a bit over $50 for a full license. Compared to other projection mapping software out there, this is an amazing bargain.

VPT 7 is completely free and feature rich, but not as intuitively user friendly. Luckly it comes with a pdf documentation with lots of pictures to walkthrough someone through every feature.

Dynamapper is a $5 app that also works, but requires some additional hardware (to connect a smartphone or tablet to a projector) and some 3d modeling experience.