The Most Venerable Order of the Hospital of St. John of Jerusalem – The largest of the Orders of St. John is the British Most Venerable Order:
http://www.saintjohn.org

The Augustan Society – An Int’l Genealogical, Historical, Heraldic, & Chivalric society based in the USA:
http://www.augustansociety.org

The Sovereign Military Order of Malta – The Grand Priory of England website:
http://www.orderofmalta.org.uk/priory.htm

The Most Noble Order of the Garter –
http://www.churchill-society-london.org.uk/garter.html

Order of Christ – A Portuguese military order, originated with the Knights Templar:
http://www.thornr.demon.co.uk/kchrist/overview.html

Society of the Golden Fleece –
http://www.antiquesatoz.com/sgfleece/

Teutonic Knights – history of the medieval order:
http://orb.rhodes.edu/encyclop/religion/monastic/opsahl2a.html

Franciscan Order of Celi De – A Celtic -Franciscan monastic community in the Anglican communion, Gray Friars and Sisters of Brigit and Clare:
http://www.geocities.com/celi_de/index.html