Saint Augustine: The Psalms
- An abridgment of the Latin original, this edition provides detailed exposition of each Psalm.
- http://www.ccel.org/ccel/schaff/npnf108.toc.html

The Psalms Translated and Explained, Volume One
- By James Addison Alexander of Princeton Theological Seminary (1852). Covers Psalms 1 to 50.
- http://quod.lib.umich.edu/cgi/t/text/text-idx?c=moa;idno=AJF7591.0001

The Psalms Translated and Explained, Volume Two
- By James Addison Alexander of Princeton Theological Seminary (1852). Covers Psalms 51 to 100.
- http://quod.lib.umich.edu/cgi/t/text/text-idx?c=moa;idno=AJF7591.0002

The Psalms Translated and Explained, Volume Three
- By James Addison Alexander of Princeton Theological Seminary (1852). Covers Psalms 101 to 150.
- http://quod.lib.umich.edu/cgi/t/text/text-idx?c=moa;idno=AJF7591.0003

Selah: Sacred Songs of the Psalter
- An ongoing expository project in the Psalms.
- http://www.tulip.org/selah/

The Treasury of David
- Originally a 7 volume commentary on Psalms written by Charles Haddon Spurgeon in the 1800's.
- http://bible.crosswalk.com/Commentaries/TreasuryofDavid/

A Practical Exposition upon Psalm 130
- Both detailed and devotional, by Puritan minister John Owen.
- http://www.reformed.org/books/owen/vol6/

Aquinas Translation Project: Psalms Commentary
- [English, Latin] Niagara University's ongoing translation of "Commentary on the Psalms" by Thomas Aquinas.
- http://www.niagara.edu/aquinas/