About 37 or so FREE books are available right now! Several are Spanish books. It's a bit too laborious to list them all, so click on the following 3 page links from Faithlife/Logos:
1. https://general.ebooks.faithlife.com/search?query=price%3A0&sortBy=Relevance&limit=60&page=1&ownership=unowned&geographicAvailability=all&autoFacets=0
2. https://ebooks.faithlife.com/search?query=price%3A0&sortBy=Relevance&limit=60&page=1&ownership=unowned&geographicAvailability=all&autoFacets=0
3. https://www.logos.com/search?query=price%3A0&sortBy=Relevance&limit=60&page=1&ownership=unowned&geographicAvailability=all