Stem Publishing has e-text copies of the bulk of early brethren writers.
CLICK HERE for their list of works linked to the gospel of John. These include mostly Darby, Kelly, Bellet, Grant, Anderson, Westcott, Hole)
http://stempublishing.com/index/bybook-nt.html#john
BibleCentre.org also has several early brethren (and some more recent) on Johns Gospel
http://biblecentre.org/commentaries/index_nt.htm#John (these include Arend Remmers, Hamilton Smith, L. Grant, Heijkoop, Fereday, etc..)
