Studying World Religions? The Internet Sacred Text Archive has digital texts of most all religions. You can find the Zoroastrian Zend Avesta, The I Ching, or Book of Changes, Baha’i texts like the Baha’u’llah, or the Babylonian Talmud, to name just few of the site’s resources.
It’s easy to search the site. It has a menu on the side with all its topics or you can simply search by title, author, or subject.