Here is the compilation of some of my favourite sites.
www.activatetantra.com: Have you ever came across the copper plates with circles, squares and symbols. These plates are called Yantras. Ever heard the Mantras like Ohm, Hreem, gleem. Atleast you must have heard them in Indian Mystic films. If these Mantras are properly utilized they will give success in every sphere of life, like education, career, married life, children, wealth and health. http://www.activatetantra.com/wp/ explains the scientific truth behind the Mantra, Yantra and Tantra. Once i was a non believer in these practices with the passage of time and experience i started believing them. The site has articles on Astrology, Numerology, Ayurveda, Philosophy, Alchemy etc.,www.activatetantra.com
shaivam.org: This website is dedicated to the shaiva sect of Hindu religion and its Lord Shiva. The site hosts the twelve Thirumurais in text form, their audio video form, Periya Purana and the life story of 63 Nayanmars, Important shiva temples in India statewise and district wise, Temples outside India in European, Asian and American countries, Scriptures like vedas, agamas,stotras, mantras, dailr prayers, temple pictures, videos, question and answers on shaiva siddhantha, Nayanmar drama, pilgirmage videos, Thirumurai dance, Baby Names of lord shiva in Sanskrit and Tamil language, Audio gallery of sanskrit stotras, spiritual lectures, Thirumurai music etc., A must to visit site for every Hindu especially for saivite.shaivam.org