"The psalms are prayer, in which God Himself teaches us how to pray; for they were written under the direct inspiration of the Holy Spirit. Herein we have the answer to the question: "What prayers shall I say?" Why the prayers of Holy Scripture itself! "There is no need to scrape together endless man-made prayers when Sacred Scripture frames the very thoughts of God." The psalms are the vital presentation of God's inspirations and man's aspirations; they are the ideal manifestations of man's hunger and thirst after God and of God's loving response to man. Of great age, they are ever new and appropriate. They are as satisfying and stimulating to us of the twentieth century as they were to men before the birth of Christ and down through the Apostolic and Middle Ages".
Rev. Joseph B. Frey; July 16, 1947.
From My Daily Psalm Book, Arranged by Father Joseph Frey, Confraternity of the Precious Blood (1947) pp.vi-ix.
..
Both the Douay-Rheims-Challoner Bible AND the Haydock commentaries are available as free resources within the e-Sword universe of software (also free).
Thus, by installing e-Sword, the DRC Bible and Haydock’s, one can for instance search for a word in the Bible and be directed to each applicable verse, and for each verse see the KJV translation (with Strong’s Concordance), but by clicking a tab, see the DRC and any applicable Haydock commentary to that verse, automatically.
Oh, and it’s free.