The first site listed has a collection of currently some 1600 Links giving access to information on all aspects of church and cathedral organs and organ music. The next two Sites listed are the leading professional associations for organists, respectively, in the UK and the USA.
Incorporated Association of Organists
The Incorporated Association of Organists was "formed in about 1916. It is the umbrella organisation for some 90 affiliated organists' associations and individual members throughout the United Kingdom and internationally."
Royal College of Organists
The Royal College of Organists is "(A) charity and membership organisation dedicated to the promotion and advancement of organ playing and choral directing."
American Guild of Organists
The purpose of the American Guild of Organists is "to promote the organ in its historic and evolving roles, to encourage excellence in the performance of organ and choral music, and to provide a forum for mutual support, inspiration, education, and certification of Guild members."
The website http://www.organrecitals.com/1/diary.php provides a comprehensive, but not exhaustive, list of organ recitals in the United Kingdom.
Paul F. Page
A composer of organ, piano and choral music, much of which is avaiable for free download on this website: http://www.paulpage.org/Welcome.html
A new Belgian website launched in January 2016 providing a continuous 24/7 stream of organ music online at www.orgelradio.eu Every day of the week has its own theme e.g. on Wednesday you can hear Dutch recordings, on Thursday it is J S Bach and on Friday Worldwide recordings ...... On Saturday you can treat yourself to your favourite music. Pick your album in the Online CD library and click on the 'mail' button to the right, Then mail your choice and you will be notified by email when your choice will be broadcast. Every two weeks the content changes.