This site has what amounts to a university level comprehensive course layout that are arranged in progressively advancing groups. From what I can see it is free. Highly recommend it
Question Everything. Things are not always what they seem. UFO's, Bigfoot,Conspiracies and a Whole Lot More- Oh My!! Just look below!!!! TTS Via Amazon AWS Polly-Translation versions of the audios are available upon request – Have Enough Courage to Start and Enough Heart to Finish. Just Listen, Read, View and Enjoy. This site is almost 50 Pages Deep, and Yes the Rabbit Hole Goes Very, Very Deep. Most of this website is readable in OVER 50 Languages by clicking on your flag at the top of the page, including text files. Audio files are in English, but are available in Most Major Languages on Request. This is a major library with almost 500 entries, which are easily searchable by selection the catagory that you want lower down this page or for specific titles or subjects from the search engine below. THIS SITE IS FREE OF CENSORSHIP!