SimProj is a Sketchup developed to help figure out the best video projector for your needs, be it for your home cinema, or for a big show involving several projectors.
According to the scale and placements available for the projector, using the plugin will determine what specs you will need to get what you want, typically in terms of brightness and perceived resolution.
You can download a free version here, which is limited to simulating one projector, and is free for personal use.
If you want to use SimProj for commercial purposes, please consider buying the PRO version, which allows an unlimited number of projectors. You can buy it from the link below.