Sketchup
Sketchup is my goto program for most of my 3D work. Since I do a lot of proposal work on limited time frames, I need something I can work with fast and have a professional outcome, Sketchup works well in that role.
The following are samples from various projects that have utilized Sketchup along with Vray (rendering), various plugins, and post processing in Photoshop. Some samples are from my day-to-day work, some from freelance and some for fun.