https://e-sword.net/ – e-Sword is the world’s most popular, free Bible study software. e-Sword runs on the PC but may also run on a Mac. Contains free features usually found only in expensive commercial products: compare versions, find word meanings, Strong’s numbering system, a parallel Bible, powerful scripture searches, a reference library, integrated editor to create your own notes, and much more.
http://www.openbible.info/geo/ – the site identifies the possible modern locations of every place mentioned in the Bible as precisely as possible.
http://classic.net.bible.org/map.php – The New English Translation (NET) is a free online English translation of the Bible. The NET Bible is the newest complete translation of the original biblical languages into English created by a team of more than twenty-five of the world’s foremost biblical scholars.
https://biblehub.com/ – contains topical, Greek and Hebrew study tools, plus concordances, commentaries, dictionaries, sermons, and devotionals.
https://www.biblegateway.com/ – BibleGateway is a searchable online Bible tool hosting more than 200 versions of the Bible in over 70 languages that you can freely read, research, and reference anywhere. The site contains many tools and resources to support those activities–things like Bible reading plans, devotionals, Bible reference works, and more.
https://bible.org/article/net-bible-synopsis-four-gospels – A synopsis is a tool that displays the four gospels side by side for comparison.
https://www.biblestudytools.com/dictionaries/ – A collection of popular Bible dictionaries used to discover definitions, proper names, and the meaning of words found in the Bible.
https://strongsconcordance.org/ – The Strong’s Concordance is an exhaustive cross-reference of every word in the King James Bible referenced to lexicons of the original languages of the Bible. Useful for the student that cannot work in the original languages.
https://www.studylight.org/dictionaries.html – FREE online Bible study tools. Contains 110+ Commentaries, 28 Dictionaries, 8 Encyclopedias and 3 Lexicons, and 12+ Devotionals.