The following are alphabetical lists of faithful Catholic Christian eBooks that are available online for reading or downloading, legally and for free, either because they are now in the public domain or because they were uploaded or published online by their lawful copyright holders:
You may also visit the List of Free eBooks (Grouped by Subject), the List of Worth-It Catholic Books & eBooks (which indexes links to for-sale books and ebooks), and the blog page of the Catholic eBooks Project (where links to ebooks and other materials are posted on feasts of the Church or other relevant occasions).
[Update: This page was reconstructed 26 August 2019 from the former arrangement, in which all texts (numbering about 1800) were listed on one page, leading to lagging loading times. We have thus far divided the said 1800 texts into 3 pages of about 600 texts each. Said reconstruction is still ongoing, so please bear with the changes, and please link to this main index page and not the sub-index pages to avoid dead links.]