Commentary on the Epistle to the Galatians
http://www.worldwideschool.org/library/books/relg/christiantheology/CommentaryontheEpistletotheGalat
T.?Graebner translation in HTML. Divided into smaller sections within each chapter with internal links.
Commentary on the Epistle to the Galatians by Mart
A verse by verse commentary written in 1535. Part of Project Wittenberg and in the public domain.
Martin Luther's Commentary on Galatians
Available as both HTML and printer-friendly text.