Natural TTS Labs converts text into spoken audio. You paste your text, choose a voice, and get speech that sounds close to a real person, which is useful for voiceovers, narration or listening to written material.
The site offers well over a hundred voices, including a set of natural-sounding multilingual ones covering languages such as English and French. It is presented as free with no hidden costs, and it runs in the browser, so you can try it without installing anything.