Here is a list of what appears to be the official SuperMemo sites. If anyone knows the differences between each, then that clarification would be great so I can edit the reference.
https://www.supermemo.com/
http://www.supermemo.net/
http://www.super-memo.com/
http://help.supermemo.org/wiki/SuperMemo
http://super-memory.com/help/faq/supermemo.htm
http://supermemopedia.com/wiki/Main_Page
https://www.supermemo.com/
http://www.supermemo.net/
http://www.super-memo.com/
http://help.supermemo.org/wiki/SuperMemo
http://super-memory.com/help/faq/supermemo.htm
http://supermemopedia.com/wiki/Main_Page