Pendragon (acquired in 1998 by Green Knight Publishing, and 2005 by White Wolf), while related, has sufficiently different mechanics that it can be seen as a separate system.
Green Knight Publishing formed to focus on Pendragon, Chaosium "proper" retained Call of Cthulhu, Stormbringer, and Mythos, while Greg Stafford (who left Chaosium in 1998) founded Issaries, Inc. to publish HeroQuest and focus on bringing new Glorantha related material into print.
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