In 2005 I wrote a simple program to use to train in the use of the Doomsday method. I recently improved it with logging capabilities and released it as free software under the GNU GPL v3 license. You can get the ragnarok at github. Releases can be foud here. Below are two screen shots. The first is compiled with Visual Studio 2013 on Windows 7 and run under Windows 7. The second is compied and run with Mono on KDE4 on GNU/Linux.