Natural Text Reader is a Free Text To Speech Application that allows you to convert your text to audio include access to 50 high quality and natural voices from 18 differents languages.
Also this app offer the capability of downloading the generated audios and also store them in your account, and you can access to them any time you want.
You can Also Read your documents (microsoft word, microsoft powerpoint, texte files, pdf, rtf)
This App offer unlimited possibilities to convert text to audio with natural human voices, you can make youtube videos using tts narration or creating courses without need to buy expansive equipements.
You can check the website for this app at https://www.naturaltextreader.com