Rapier Rules across the SCA
The current SCA Corporate Rules can be found here.
And for historical comparison purposes, the original SCA rapier rules can be found here.
Ansteorra This is a link to all the martial documents for Ansteorra. Scroll down to the "Ansteorra Complete Participants Handbook - July 2017" link for the fighting rules. Ansteorra basically uses the Society rules, except as noted in this handbook.
Artemisia Artemesia uses the Society rapier rules with no variations.
Ealdormere This is the Kingdom Library page. Scroll down for the pdf of the rapier rules.
Last updated November 16, AS 52 (2017)
(I try to check these links every few months, but I'm only human. If you notice that a link is out of date, please let me know.)