Altium provides a nice web-based tool to visualize PCB designs. Because manually uploading the project files trough the web interface can become a bit cumbersome, I created this little command line-tool which takes care of uploading the project to Altium servers and opening it in its own desktop window.
You will need to install Go first.
go get -u github.com/jmichiels/altium-viewer/cmd/altium-viewer
altium-viewer an_altium_designer_project.zip