If you know the IP address of the workstation with the VM, you can just point the LAN computers’ browser to http://x.x.x.x:8000 (8000 is the default port on the production.ova - 8080 is the default for the development.ova)
@trentmu is correct. So if your work station has a LAN IP of say 192.168.1.20 then other users on the LAN can connect to frappe by typing 192.168.1.20:8080 into their web browser. If your local router is setup to deliver local IP address by DHCP, Each time you restart your work station you will need to check and possibly change your IP address to what ever your router has given to your workstation. For example maybe 192.168.1.23:8080