I guess it's been a long time since I've given this thread any love, but this month's
Logos freebie is a good one:
History and Theology in the Fourth Gospel (3rd edition) by J. Louis Martyn. This is a volume in the phenomenal
New Testament Library series, published in the US by Westminster John Knox Press.
Logos typically offers several related add-on books that are not free, but drastically reduced in price. This month's are two from each of the complementary
Old Testament Library and the more recent
Hermeneia series. All are by accomplished and respected academic scholars.
Hermeneia: 1 Peter by Paul J. Achtemeier is $1.99.
The Book of Exodus by Brevard Childs is $3.99.
Hermeneia: Daniel by John J. Collins is $5.99.
The two-volume
Theology of the Old Testament by Walther Eichrodt is $9.99.
The books can be read in the
free Logos software or
online, but can't be liberated by Alf's tools. If you have the patience and tenacity, they can be exported to HTML a few pages at a time and stitched together. I once spent a few days turning one of the Anchor Yale Bible volumes into an epub to prove to myself that it was possible, but have since found better uses for my time.
There are also monthly free books for Logos at
Verbum (the Catholic version of Logos) and
Faithlife (for more popular works, rather than academic).