Charles Hodge: An Exposition of the Second Epistle to the Corinthians - Delves immediately into verse exposition adding context from related passages in Acts and First Corinthians along the way. Published in 1862 (Image, text, PDF). - http://quod.lib.umich.edu/cgi/t/text/text-idx?c=moa;idno=AJH0319
Catena Aurea: Gospel of Mark - Bible commentary on the Gospel of Mark by Thomas Aquinas (1225?-1274). - http://www.ccel.org/ccel/aquinas/catena2.html
Catena Aurea: Gospel of Matthew - Bible commentary on the Gospel of Matthew by Thomas Aquinas (1225?-1274). - http://www.ccel.org/ccel/aquinas/catena1.html
Bible Gateway: InterVarsity Press Commentaries - Covering much of the New Testament, this evangelical series provides concise commentary, and background information on authorship, setting, theme, and interpretive issues. - http://www.biblegateway.com/resources/commentaries/
Matthew Henry's Commentary on the Whole Bible:Titus - Commentary published in 1721 which looks at biblical passages chapter by chapter, and section by section. - http://www.ccel.org/h/henry/mhc2/MHC56000.HTM
Matthew Henry's Commentary on the Whole Bible: Jude - Commentary published in 1721 which looks at biblical passages chapter by chapter, and section by section. - http://www.ccel.org/h/henry/mhc2/MHC65000.HTM
Selected New Testament Commentaries - Bibliography prepared by Covenant Seminary's Buswell Library. - http://www.covenantseminary.edu/pdf/SelectedNTCommentaries.pdf
SpiritAndTruth.org: Listener's Commentary - Slideshows and mp3 downloads by several teachers covering portions of the New Testament. - http://www.spiritandtruth.org/teaching/13.htm
Christian Bible Links - Commentary by book and chapter, often utilizing the Greek text. - http://www.christianbiblelinks.com/
John Gill's Exposition of the Bible - Commentary on the New Testament by a contemporary and coworker of C. H. Spurgeon. - http://bible.crosswalk.com/Commentaries/GillsExpositionoftheBible/
YashaNet: Studies - Detailed studies with commentary on Matthew, Romans, and Revelation. - http://www.yashanet.com/studies/
Bible Study Net - Verse exposition for Matthew and many of the epistles, some topical articles including grace, sovereignty, and reconciliation. - http://www.ais-gwd.com/~cdevans/