The Koran is the primary religious text of Islam, believed by Muslims to be God's revelation to the prophet Muhammad through the angel Gabriel. The text concerns many of the same stories and prophets as the Judeo-Christian tradition with some variations. The text concerns holy prophets, the afterlife and God's final judgment and the proof of God's existence, expressed through a non-linear and semi-poetic style. The Koran establishes aspects of Islamic practice and tradition as well as values of faith, charity, self-purification and piety.
This is a good choice if you're looking for a quick read or refresher rather than an in-depth analysis. You'll get a brief book summary and chapter by chapter breakdown. The website loads quickly with minimal advertising.