Xeyes
IEyes v.1.1.1
xEyes clone for Mac OS X.
Cygwin/X v.1.0.4
Cygwin/X consists of an X server, X libraries, and nearly all of the standard X clients, such as xterm, xhost, xdpyinfo, xclock, xeyes, etc.
JEyes v.0.2
A pair of eyes follow you as you work.