BibleGateway's Dictionaries and Encyclopedia, include:
Hitchcock's Bible Names
All the Men Of The Bible
All The Women Of the Bible
Dictionary of Bible Themes
Easton's Bible Dictionary
Smith's Bible Names Dictionary
Encyclopedia of the Bible (based on the Zondervan Pictorial Encyclopedia of the Bible)
This site provides a "Quick Reference Dictionary" that links to:
Baker's Evangelical Dictionary of Biblical Theology
Nave's Topical Bible
Easton's Bible Dictionary
Hitchcock's Bible Names
Smith's Bible Dictionary
International Standard Bible Encyclopedia
25 dictionaries covering not only biblical words but biographies, illustrations, theological topics etc.
An online reference work from Oxford University Press, 2010.
Encyclopedia Of The Bible - (Bible Gateway) - based on the Zondervan Pictorial Encyclopedia Of The Bible
For Microsoft Windows devices. Includes:
Easton's Bible Dictionary
Smith's Bible Dictionary
Hitchcock's Bible Names Dictionary
The King James Version (KJV) Bible Dictionary
Nave's Topical Bible
the Condensed Biblical Cyclopedia
Torrey's New Topical Textbook
Commentary Critical and Explanatory on the Whole Bible (JFB Commentary)