UPDATE: The newer version is DIYDodecad v 2.1
There are many new features in DIYDodecad 2.0, including by-chromosome and by-segment ancestry analysis, and a visualization tool that can be used in conjunction with it. Simple admixture analysis as in version 1.0 is, of course, also included.
You can download the RAR archive from Google Docs (File->Download original) or Sendspace. DIYDodecad works for Windows and 32/64bit Linux.
Here is the chromosome #3 of a project pariticipant for 3 components of interest.
A different region on Chromosome 4 on a different set of components:
Bug reports/suggestions for improvement are always welcome at firstname.lastname@example.org
NOTE: In Windows, the result files and dv3.par file will not look good if you open them with Notepad, because of the different way in which Linux and Windows represents new lines. So, you should edit/look at these files using another text editor (e.g., Wordpad, Textpad, Word), but make sure you always save them as plain text (.txt) files.
UPDATE: additional calculators (21 Sep 2011)
Additional calculators have been released by the Dodecad Project: