Jagadgurus.org : A site dedicated to the Jagadguru Shankaracharyas of Shringeri Sharada Peetham.
Kanchi Kamakoti Peetham : The official site of the Kanchipuram matha. It's acharyas have been amongst the foremost exponents of Advaita Vedanta in modern times.
Chinmaya Mission : An organization founded by Swami Chinmayananda
Divine Life Society : An organization founded by Swami Shivananda Sarasvati.
Swami Rama Tirth : A noted Punjabi Advaitin of the early 20th Century.