Educator Resources
The Catholic News Archive - an archive of thousands of Catholic newspaper pages from different cities over multiple years
Library of Congress - primary resources, online digital collections, teacher resources, etc.
The Little Books app (Android) and Little Books Daily Prayer Book 4+ (Apple) will give you access to the three seasonal books published every year by Little Books of the Diocese of Saginaw: Advent/Christmas Season, Lent, Easter.
Helping Students Learn
Learning (Memory) Principles from Auburn University a number of specific ways to assist with remembering and learning.
History
Teaching Schindler's List from Facing History and Ourselves " ... draw lessons from the past that help students think about their own choices.