The unholy agglomeration of Linux/open source content websites started by Andover.net, which was itself gobbled up by VA Linux. Origin of the term is a posting by the newsletter NTK, which itself could be viewed as an unholy agglomeration. The Keiretsu currently includes such sites as Slashdot.org, Freshmeat.net, Thinkgeek.com, and, uh, some other sites. Also known as OSDN.