DragonQuest is a fantasy roleplaying system introduced by SPI.
The DragonQuest Players Association (http://www.dragonquest.org/) has been a longstanding connection point for DragonQuest.
The most active group of DragonQuest players is the Seagate Adventurers Guild (http://www.dq-nz.org/dqwiki/index.php?title=Main_Page) in Auckland NZ. They are also responsible for developing some supplemental materials (http://www.dq-nz.org/dqwiki/index.php?title=New_Players#Guides_and_Booklets_that_may_help)
For many years, the DragonQuest online community hub was organized around Yahoo Groups:
Archive of the old DragonQuest Newsletter from the late 1990s and early 2000s: