Kekkaishi is a 52 episode series that aired from October 2006 through February 2008. Vampire Knight originally ran as a 13 episode series between April and June 2008. It’s not immediately clear whether they have licensed the 2nd season, Vampire Knight Guilty, or not, which ran between October and December 2008 as another 13 episode season.
InuYasha: The Final Act is the just announced “final season” of the Inu Yasha anime series that will start airing in Japan in October. It’s also going to stream on TheRumicWorld.com, though details on that aren’t clear yet.