I have been working on a commentary on the Psalms. I have decided to compile some helpful links that I discovered during my research. It includes a mix of exegetical and sermonic links. Here is what I have for Psalm 23 (in no particular order). Feel free to mention any that you find helpful in the comments section.
Spokane Bible Church: http://www.spokanebiblechurch.com/books/psalm-23
Literary analysis of Psalm 23: http://psalmsstudy.com/psalms-literary-analysis-by-chapter/literary-analysis-psalm-23
Ray Stedman., “The Shepherd Psalm,” Psalm 23: https://www.raystedman.org/old-testament/psalms/the-shepherd-psalm
Analysis by C. J. Labuschagne: https://www.labuschagne.nl/ps023.pdf
William Barrick’s notes: https://drbarrick.org/files/studynotes/Psalms/Ps_023.pdf
“The Good Shepherd” David Klingler: https://voice.dts.edu/chapel/the-good-shepherd-klingler-david-r
John Piper, The Shepherd, the Host, and the Highway Patrol: https://www.desiringgod.org/messages/the-shepherd-the-host-and-the-highway-patrol