COMMENTARIES
The Asbury Bible Commentary
http://www.biblegateway.com/resources/asbury-bible-commentary/toc/
Free Bible Commentary by the Rev. Dr. Bob Utley, retired professor at East Texas Baptist University
Old Testament books
http://freebiblecommentary.org/old_testament_studies/written_commentaries.htm
New Testament books
http://freebiblecommentary.org/new_testament_studies/written_commentaries.htm
Calvary Chapel's founder Chuck Smith https://www.studylight.org/commentaries/csc.html
New Testament: InterVarsity Press New Testament Commentaries
http://www.biblegateway.com/resources/ivp-nt/toc/
The Reformation Study Bible commentaries https://www.biblegateway.com/resources/reformation-study-Bible/toc/
Enduring Word - Bible Commentary Of The Whole Bible with Pastor David Guzik (Calvary Chapel churches in the U.S. and Germany) https://enduringword.com/bible-commentary/
ANCIENT HISTORIANS
Volumes of Greek and Roman writers Perseus Project, Tufts University
http://www.perseus.tufts.edu/hopper/collection?collection=Perseus:collection:Greco-Roman
Josephus
http://www.ccel.org/ccel/josephus/works/files/works.html
Church Fathers Studylight
http://www.studylight.org/his/ecf/
Church Fathers -- Calvin College Website
http://www.ccel.org/fathers.html
Finding Bible verses for everyday life topics