Bible.org has articles organized by both topic and by book of the Bible. The site is connected to Dallas Theological Seminary and is the home of the NET Bible, which has translation notes that accompany the text.
BibleGateway.com is one of the easiest to use Bible searching websites. It has many commentaries, which includes The IVP New Testament Commentary Series.
BibleStudyTools.com provides a number of helpful study tools for free—including commentaries, concordances, dictionaries, encyclopedias, and lexicons. Similar sites are www.studylight.org, www.e-sword.net, and www.blueletterbible.org.
DeeperStudy.com has probably two dozen classic commentary sets available online. One of the most expansive lists of online commentaries (organized by book of the Bible) is found here.
The John MacArthur Sermon Archive has sermons preached through every verse of the New Testament (both in audio and transcript form). The topical Q&A section is also practical with biblical instruction on a wide variety of issues.
BiblicalTraining.org makes Christian education available online for free. They have three types of classes: new believer, leadership development, and seminary training.
Considering being a Biblical counselor or disciplining others? This site has counseling audio training sessions with corresponding outlines.
A popular blogger with trusted book reviews.
ACBC certifies Biblical Counselors. They server pastors and anyone with a desire to make disciples. ACBC also has a blog and Podcasts on 70 topics dealing with the issues of life.
BCC, in addition to resources for dealing with life by topic or author, has trusted counseling and discipleship book reviews.
CCEF, in addition to items for purchase, offers free podcasts, videos, and blogs on the struggles of life.
Faith Baptist Church has sermons easily searched by Scripture, author, series, date, or topic. The audios are accompanied by notes and handouts.
IBCD houses a selection of free articles, audios, and handouts by speaker, topic, and series. Some audios also have PDF’s and additional handouts.