Here are some miscellaneous Catholic related digital items I have found very useful over the years
- The essentials: Catechism and the Bible (Complete, Douay-Rheims)
- Other essential Catholic works: Catholic Mass Basics, Imitation of Christ, Catechisms of Trent, St. Pius X, and Butler’s Lives of the Saints
- Common Catholic Prayers, Bible Cheat Sheet for Protestant Evangelization
- Pro Life Resources in another post on this site
- Divine Mercy and Our Lady of Guadalupe high resolution single page poster printouts. Ideal for posting anywhere (I laminate them and use them as bumper stickers on my car)
- Audio: anything on www.audiosancto.org, CatholicAudio.blogspot.com.
- Nice looking printouts of the basic Rosary prayers: good to post in your house if anyone does not know them by heart Apostle’s Creed, Our Father, Hail Mary, Glory Be
Daniel O'Connor's Blog 
Technique for lamination and use as bumper stickers?
God bless you,
Tom