Check the section on local content here: http://www.marmoset.co/viewer/support#local Running locally tends to work in Firefox, but for Chrome and other browsers you will need to run a local server (which is very easy, instructions in the link above).
Hi Chris, it currently is possible to use Marmoset Viewer offline, but you may need to run a local HTTP server. This is not difficult to do though, see the local content section here: http://www.marmoset.co/viewer/support WASD movement is something we may consider adding in the future.