Freemasonry Today – A magazine for not only Freemasons themselves, but for those who may be less familiar with Freemasonry, what it is, issues today; etc.:
http://www.freemasonrytoday.co.uk

The Philalethes Society – ‘world’s oldest and largest Masonic research society’:
http://freemasonry.org/psoc/

Philosophical Research Society – founded in 1934 by Manly P. Hall; good source of information on western esoteric traditions and philosophies, including Freemasonry:
http://www.prs.org

Canonbury Masonic Research Centre, London – an educational institution supporting the independent study of Freemasonry; seminars, lectures, library:
http://www.canonbury.ac.uk

United Grand Lodge of England (London) – Information about Freemasonry, library, museum, Masonic history:
http://www.grand-lodge.org

Co-Masonry – ‘Freemasonry for men and women’:
http://www.co-masonry.org/

Grand Lodge of Scotland (Edinburgh) – Information about Freemasonry, library, museum, Masonic history, Robert Burns:
http://grandlodgescotland.com

Ancient and Accepted Scottish Rite of Freemasonry (USA) –
Lots of information about Freemasonry on both these sites:
Southern Jurisdiction: http://www.srmason-sj.org
Northern Jurisdiction: http://www.supremecouncil.org