Warburg Institute (University of London) – to further the study of the classical tradition, those elements of European thought, literature, art and institutions which derive from the ancient world; it houses an important library, archive, and collection of photographs:
http://www.sas.ac.uk/warburg/

Francis Bacon Research Trust – Founded by Peter Dawkins, the FBRT is concerned with the life and work of Sir Francis Bacon, the Rosicrucians, and other ancient and ageless wisdom; resource site, as well as an informative journal, conferences, workshops:
http://www.fbrt.org.uk

The Temenos Academy (London) – a reg. charity which aims to offer education in philosophy & the arts in the sacred traditions of East and West; informative lectures:
http://www.princes-foundation.org/foundation/tenemos.html

Abwoon Study Circle – Sufi research, workshops & publications in the field of Native Middle Eastern spirituality, the Aramaic Jesus, and the work of Dr. Neil Douglas Klotz and Kamae A. Miller, M.A.:
http://abwoon.com

Theosophical Society in America (Wheaton, IL, USA) – The US headquarters of the Theosophical Society
http://www.theosophical.org