Jewish Encyclopedia: Nimrod 
Overview of the wicked king from the traditional Jewish perspective, including rabbinic commentary.
http://www.jewishencyclopedia.com/view.jsp?artid=295&letter=NNimrod
Passages about the early king from the King James version of the Bible.
http://www.topical-bible-studies.org/48-0082.htm
Catholic Encyclopedia: Nemrod
Commentary on the Cushite king from the traditional Catholic perspective.
http://www.newadvent.org/cathen/10741a.htm
Concerning The Tower Of Babylon, And The Confusion Of Tongues
Chapter about Nimrod and the Tower of Babel, by the first-century Jewish historian Josephus.
http://www.interhack.net/projects/library/antiquities-jews/b1c4.html
