To download Umigumi, you can type the following two commands:

  urpmi.addmedia nexedi http://www.nexedi.org/static/RPMS/ with synthesis.hdlist.cz
  urpmi umigumi

If you want an up to date package, use the "UmigumiCVS", either directly, or through the tarball builder extension :

http://openbrick.org/cgi-bin/viewcvs.cgi/umigumi/umigumi.tar.gz?tarball=1