Zebedee is a simple program to establish an encrypted, compressed "tunnel" for TCP/IP or UDP data transfer between two systems. This allows traffic such as telnet, ftp and X to be protected from snooping as well as potentially gaining performance over low-bandwidth networks from compression.
Of course, Zebedee is by no means the first, or only secure tunnel program available. It does not pretend to compete with the likes of ssh, SSL or FreeS/WAN in terms of breadth of function but if you want something quick, simple and completely free then it may be the tool for you.