[Koha] Katipo/Koha Relationship With Greenstone Question

http://www.greenstone.org/ Is there any relationship between Koha, with particular reference to Katipo Communications or other current NZ developers, and Greenstone? Would Greenstone and Koha be seen as having competing (presumably on friendly terms) or complimentary interests? Greg Greg Lawson Rolling Hills Consolidated Library 1912 N. Belt Highway St. Joseph, MO 64506