The List of Popes  
   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
   http://www.newadvent.org/cathen/12272b.htm

Popes Through the Ages  
   By Joseph Brusher. Papal lineage table, and brief accounts of the pontificates of every bishop of Rome from St. Peter the Apostle to the present.
   http://www.cfpeople.org/Books/Pope/CFPtoc.htm

Popes of the Roman Catholic Church  
   A table from The Columbia Encyclopedia, 6th ed., in chronological order. Some entries linked to biographical articles.
   http://www.bartleby.com/65/po/popesTABLE.html

Papal Encyclicals Online  
   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.
   http://www.papalencyclicals.net/