Fallen Stars of Pern - A strict canon, full post play-by-email club set during a Tenth Pass where AIVAS plan failed and the grubs were destroyed by parasites. - http://fsop.pbemrealm.com/
Triad Weyrs - A strict canon, full-post club set on the Southern Continent during an alternate Tenth Pass where AIVAS' plan failed and Thread returned after a 1200 turn Interval; featuring a post-plague female oppression scenario. - http://www.triadweyrs.org/