
Here are my top 3 (off the top of my head):
- Desiring God Resource Library – all of Piper’s books in PDF form (searchable!), all of his sermons transcribed (quick reading!). Amazing.
- Dr. Constable’s FREE online commentary of the entire Bible - I will not teach a passage of the Bible without first consulting with this commentary. Dr. Constable is a professor at Dallas Theological Seminary. I’ve been studying through Romans in my Quiet Times this summer and his commentary has been an immense help (and I love that you can copy and paste notes from it into a Word document (where I journal). In addition to his commentary I was using the Expositors Commentary and I found Constable’s to be far better (and he actually quotes the Expositors Commentary half the time).
- Gospel Coalition site - specifically Justin Taylor’s blog but the whole site is searchable from there
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