3 links
Papal Encyclicals Online
papalencyclicals.net
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 i…
Popes of the Roman Catholic Church
bartleby.com
A table from The Columbia Encyclopedia, 6th ed., in chronological order. Some entries linked to biographical articles.
The List of Popes
newadvent.org
In chronological order. Links to a biographical essay on each pontiff up through Pope St. Pius X (d. 1914), from the 1913 Catholic Encyclopedia.