In chronological order. Links to a biographical essay on each. For popes up through Pope St. Pius X (d. 1914), entries are taken from the 1913 Catholic Encyclopedia. Information on later popes is taken from Joseph Brusher's 'Popes Through the Ages.'
Archive of encyclicals and other papal documents. Fairly complete from Pope Gregory XVI (1831-1846) to the present; some documents from earlier popes, as far back as Honorius III in 1227.