A good, easy to use, easy to understand, and free propagation program is
available from http://www.qsl.net/w6elprop/. A google search on w6elprop
produces links to a couple of tutorials on using it.

Roy Lewallen, W7EL
(not to be confused with Shel Shallon, W6EL who has generously made his
W6ELProp program available at no cost)