Some material on Saladin and the Third Crusade with a great clip from Kingdom of Heaven, which is a recreation of the Siege of Jerusalem using modern special effects!
Great clip from ‘Kingdom of Heaven’ showing trebuchet and siege engines in action, with greek fire used by attackers and defenders:
This is one of the best summaries of the First Crusade that I have seen but the tone is a bit dry!
Khan academy on the Crusades
Similarly, these are not exactly exciting, but they are really excellent for content.