Below are links to six websites that generate tag clouds or word clouds. Most of these sites provide a variety of options for font, color, and block shape. To better compare the sites, I have used the Gettysburg Address, written and given by Abraham Lincoln in 1863. This famous speech is short (10 sentences) and well-written.
This last link is not for a site where you can generate clouds, but instead contains word cloud art of each book of the Bible.