Modern Hagiography
Lives of the Saints by Alban Butler.
Lives of the Saints by Sabine Baring-Gould.
Our Birthday Bouquet Culled from the Shrines of the Saints and the Gardens of the Poets by Eleanor C. Donnelly.
Pictorial Half Hours with the Saints by Auguste François Lecanu.
Medieval Hagiography
The Cult of Saints in Late Antiquity Database
Excerpts from their Acts (also in Butler, above)
Acts (not in the public domain)
Dulcita by Hrotsvitha
Art & Architecture
The Saints in Art by Joseph Maria von Radowitz.
Nihil sub sole novum 