Cartesia Sonic (https://cartesia.ai/sonic) is a “Text-to-Voice” application deployed with two versions: a text generation version and a searchable audio chatbot version.

12 French-speaking voices. Own voice can be added.
Export wav.

Note: an agent mode is available, which allows oral dialogue based on an instruction. In the United States, agent mode can answer phone calls.

20000 free credits per month (1 credit equals 1 character).
During tests, the credit sliders do not move.

Source for the tests: Art poétique de Velaine and definition of generative AI on Wikipedia