Pedigree Planner for thoroughbreds, developed by Anne Meredith, is now available exclusively from www.mateyourmare.com, this has a database of over 200,000 horses including past and present champions from around the world plus stallions standing at present in Australia, New Zealand and the U.S.A, as per the listings on www.mateyourmare.com website plus Australia and New Zealand Studbook of mares at stud.
Here are some of the features for a more detailed list click on the User guide.

You can insert any hypothetical mating of any stallion over any mare and see with the line-breeding showing in colours of your choice to 7 generations appearing on your computer screen.

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Below shows a pedigree with male lines in blue and female lines in red with only double-ups on both sides