Amitabha Foundation http://www.amitabhafoundation.org/
Founded by H.E. K.C. Ayang Rinpoche to preserve Tibetan culture and support Tibetan refugees in exile. It's activities reflect the intertwining of Buddhism and Tibetan culture.
Bodhicharya http://www.bodhicharya.org/
A non-profit educational association directed by Ringu Tulku Rinpoche aimed at exposing the ancient wisdom of Buddhism to the modern world while preserving it in Tibet and the Himalayas. List of projects and Rinpoche's teaching schedule.
Buddha Mandala Foundation http://buddhamandala.org
The foundation promotes the Vajrayana tradition. Its Dharma Apprenticeship Program presents the whole of life as the path to enlightenment through cultivating love and wisdom. Contains a list of events and local centers, and a collection of teachings on the Paramitas, Lojong, Tonglen, Bodhicitta, and basic topics. (Requires Flash 5.0)
Chagdud Gonpa Foundation http://www.snowcrest.net/chagdud/main/cgf.htm
To preserve Nyingma teachings and to provide instruction in the traditions of Vajrayana Buddhism, especially the arts, philosophy, and meditation practices. Sponsors many events and retreats throughout the year. Established in 1983 by Chagdud Tulku Rinpoche.
Chokling Tersar Foundation http://www.choklingtersar.org/
Organization devoted to preserving the tradition of the Chokling Tersar lineage of Tibetan Buddhism. Based in California, place for teaching and practice of the Vajrayana tradition of Buddhism following the lineage passing through Tulku Urgyen Rinpoche and Dilgo Khyentse Rinpoche. The spiritual heads are H.E. Tsikey Chokling Rinpoche and Chokyi Nyima Rinpoche, the abbot of Ka-Nying Shedrub Ling, one of the largest monasteries in Nepal.
Dharma Friendship Foundation http://dharmafriendship.org
Dedicated to the study and practice of Buddhism. Online library of articles and Dharma audio, plus class information. Resident teacher: Venerable Thubten Chodron. Located in Seattle, Washington.