Ramakrishna Paramhansa and Swami Vivekananda: Official Website of Sri Ramakrishna Math and Mission
Ramana Maharshi: Official website of Sri Ramanashram.
Swami Chinmayananda: A saint of Advaita traditionFounder of Chinmaya mission.
Swami Sukhbodhananda: Author of Best selling book Manase relax please, and his famous lectures on "personal excellance through Bhagawat Gita" aired on Astha TV from 11.00 to 11:15 pm Indian Standard Time from Monday to Thursday.
Swami Ramsukhdasji Maharaj: A hundred year old saint who is acknowledged by all the modern saints. His main teachings are based on Gita with more emphasis on Bhakti Marg or Yog, But not plain bhakti, but the one mixed with Jnana (knowledge). Sadhaka Sanjivani is the famous book written on Gita. He was a devotee of Lord Rama, meditated on Lord Rama and reached the ultimate truth.
Paramhansa Yogananda: Saint of Kriya yoga order. Author of best selling book "Autobiography of a yogi". Instrumental in creating spirituality in the west specially in America.
Maha Avatar Babaji: A saint who has conquered death and achieved immortality. Sustainer of Kriya Yoga tradition since more than 1800 years.
Wikipedia: This is a online free dictionary and contains a lot of imformation about different saints, gurus, religions and different paths of salvation.
http://www.angelfire.com/me2/sutras/ : This site contains quotes of many spiritual leaders, specially Ramakrishna Paramshansa.
This page contains the links to other useful websites
Divine Life Society : This website contains much useful information spirituality. You can visit the section "saints" at the url: http://www.dlshq.org/saints/saints.htm and also the downloads sections. This website has a lots of downloads in pdf format, which explains you about different religions and their religious leaders. It also explains the importance and inner meaning of different religious festivals. It is recommended to see this site.
Sanskrit Documents list : This page contains the list of downloads of Sanskrit texts created by Bhagawan Adi Shankaracharya in different file formats.
Indiayogi : This links takes you to Gurus and Saints of Insia website and it contains the Bibliography most of the popular saints along with other stuff. The articles written are precise and cover their biographies.