You may find these sites of interest:

The Stewart Society
www.stewartsociety.org

The Monarchist League
www.monarchy.net/leaguei.htm

The Society of King Charles the Martyr
www.skcm.org

The Jacobite Heritage
www.jacobite.ca

The Ist Marquis of Montrose Society
www.montrose-society.org.uk

Jacobitism in Northumberland
http://www.northumbrianjacobites.org.uk/

('The Fifteen' or Northumberland Jacobite Society have a page on the above at) http://www.northumbrianjacobites.org.uk/society/society.htm

The Order of the Lion Rampant
www.defendersofscotland.org

Jacobite online discussion group
groups.yahoo.com/group/Jacobite
(This group exists for the exchange of information and views about all aspects of Jacobitism past and present - it is not a Society as such).

Lowestoft Porcelain
www.lowestoftporcelain.com

1745 Association
www.1745Association.org.uk

The Order of the Crown of Stuart
www.crownofstuart.org.uk

The Jacobite Studies Trust
www.jacobitestudiestrust.org