None that I know of, but you can start by creating one form with FormStyle fsMDIForm and another with fsMDIChild, setting the Parent of form fsMDIChild to the form fsMDIForm.
Setting Parent will raise AV afair.
Make main form = fsMDIForm.
For mdichilds (form must be fsMDIChild):
with TMyMDIChild.Create(MainForm or Application) do
Show;