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 27 (in no particular order). Feel free to mention any that you find helpful in the comments section.
The Fathers on Psalm 27: https://pursuingveritas.com/2019/08/13/the-fathers-on-psalm-27
Spokane Bible Church: http://www.spokanebiblechurch.com/books/psalm-27
Literary analysis of Psalm 27: http://psalmsstudy.com/sing-learn/literary-analysis-psalm-27-adonai
Analysis by C. J. Labuschagne: https://www.labuschagne.nl/ps027.pdf
William Barrick’s notes: https://drbarrick.org/files/studynotes/Psalms/Ps_027.pdf
“Beholding the Beauty of the Lord” sermon by s. Lewis Johnson: http://sljinstitute.net/miscellaneous-topics/beholding-the-beauty-of-the-lord