From Julius van der Werf:
Note,
the following are excel spreadsheets (often including a macro). They are meant to
help you get started if you are interested. I
cannot be held responsible for any commercial damage that you think are the
result of using these spreadsheets. There is generally
no help (except by email) and sheets and cells are not fully protected. I have
not always spend the time to make them fully user's friendly. However, I hope
some of these can be useful for you. Comments welcome
at: jvanderw@une.edu.au
The following have a lower degree of user friendliness
From Brian Kinghorn: