From Sewell Development:
FastLynx allows you to transfer files from PC to PC quickly and easily using a serial, parallel, or USB bridge cable. The Premium Package includes a USB 2.0 bridge cable for transfer speeds up to 480 mbps, along with serial and parallel cables for connecting to older computers, or to DOS or Linux-based computers or devices. FastLynx also supports infrared and TCP/IP transfers. FastLynx includes a Linux and a DOS slave program for Windows-Linux or Windows-DOS transfers using serial or parallel ports.