Bernard of Clairvaux (I believe he is Catholic) On Loving God is a fifteen chapter work on love, on its degrees, and various other elements of true love
Gaebelein’s work, the Lord of Glory, is a work on Meditations on the Person, the Work and Glory of our Lord Jesus Christ.
Murray, Andrew – Lord Teach Us How to Pray is a short 4 chapter work on learning how to pray from Jesus and his teachings.
GraceGems devotional (from 2001)
Vess How to Win our Loved Ones to the Lord (Soulwinning) by Nazarene author Arthur Vess explores the topic of evangelizing our loved ones, focusing on breaking the repetition of unsaved people having unsaved children.
Chafer – True Evangelism a study of what is biblical evangelism
A Christian Library by John Wesley – Part1 is a very large library of Wesleyan view works, consisting of 16 volumes of works in this single module.