It's a bit late in the month, but I just noticed that the free book from Faithlife this month is
Forensic Faith by J. Warner Wallace. His other popular books,
Cold Case Christianity and
Alive, have been free in regular ebook format from the publisher, but I didn't yet have
Forensic Faith. Note that like other recently discussed books, this adds a book to your Logos account/software and isn't a standard epub, PDF, or Kindle book.
Monthy free book from Faithlife
Monthly Logos book (this month is
Interpreting the Pentateuch: An Exegetical Handbook)
Monthly Verbum book (this month is
Foundations of Systematic Theology)