Trimble SketchUp is a professional standard for those in construction and design fields. It’s also great for playing with geometry.
SketchUp YouTube Channel
Want a whole trainset running in SketchUp on your PC?…. Check out this insane plugin! written by Christina Eneroth, a student of architecture and incredibly talented programmer.
Run your own trainset in SketchUp with this really cool plugin.
How to install SketchUp plugins
3Dwarehouse- free SketchUp models
DOWNLOAD THE SKETCHUP MINECRAFT TEMPLATE- FOR DOING “PROPER” MINECRAFT MODELS QUICKLY!
DesignerDojo has come to Minecraft