Is there a totally free text to speech software?

Yes. If your main priority is genuinely free text-to-speech without a subscription or daily listening limit, SayTXT is worth trying. It works on both Android and iPhone and lets you paste text or open PDFs, documents, webpages, and other content and listen to them with adjustable playback.

Another simple option is the built-in accessibility features on your phone. On iPhone, Speak Screen and Speak Selection can read text aloud and let you adjust the speaking rate. Android also has built-in Text-to-Speech settings where you can choose the voice, language, speed, and pitch.

For regular reading of articles, notes, and study material, I'd personally start with the built-in phone reader or SayTXT before paying for a premium TTS service.