Ovftool is a command line tool that allows the direct copy of virtual machines on ESXi hosts even if no shared storage is available. With the tool you can, in general, import and export OVF packages among VMware products and you just need to indicate the source and destination host, with related administrative credentials.
OVF Tool is available for Windows (32 and 64 bits), Linux and Mac OS X (user guide here).
Download it here.