Recently on a Christian librarian email list that I subscribe to, the discussion turned to online study Bibles. In a flurry of replies, here's the list of favorite online sites:
The Bible Gateway is a tool for reading and researching scripture online -- all in the language or translation of your choice! It provides advanced searching capabilities, which allow readers to find and compare particular passages in scripture based on keywords, phrases, or scripture reference.
Bible Study Tools
Bible Study Tools gives Christians of any age and at any stage the opportunity to read, study, understand, and apply the Bible to their lives. With free devotionals, study guides, helpful articles, and rich personalization functions, visitors to Bible Study Tools will be able to make the most of their Bible study time, and unlock its meaning for their lives in new and important ways.
Blue Letter Bible
BLB includes 18 Bible versions, commentaries, audio/visual, lexicons and dictionaries, maps, etc. The KJV includes Strongs Concordance, Thayer's Dictionary, etc.
HCSB Study Bible
The HCSB (Holman Christian Standard Bible) Study Bible has been carefully developed and designed for study Bible readers with more than 15,000 study notes, 290 word studies, 141 photographs, 62 timelines, 59 maps, 24 articles, 16 illustrations and reconstructions, 15 charts, 3 Bible reading plans, and much more.
NetBible (new) & NetBible (classic)
The NET Bible ™ Learning Environment offers the most comprehensive set of free resources available online, including commentaries, articles, word studies, original biblical languages and cross references all integrated into a system that empowers you to carefully study the Word of God and to prepare your teaching lessons quickly.
Multiple versions, many languages, able to display parallel versions. Hosted by Biola University.
YouVersion provides interactive access to 41 translations of the Bible and includes customizable reading plans, social networking, and the ability to sync your account between your computer and mobile phone.
All-in-One: Bible Versions and Translations
The All-in-One Biblical Resources Search is divided into the following six sections: Bible Versions and Translations, Greek New Testament, Biblical Resource Sites, Ancient World & General Academic and Religion.