The Nynorsk Bokmål dictionary comes from the MySpell one:

  Norwegian dictionaries (bokmål and nynorsk) for MySpell, i.e.
  OpenOffice.org, Mozilla etc. Should be quite complete, but come with
  no warranty whatsoever. Based on Rune Kleveland's Norwegian ispell
  dictionaries, and covered by its licence (GPL). For more information,
  please refer to http://folk.uio.no/runekl/dictionary.html

  24 September 2003, Toralf Lund <toralf@procaptura.com>