TextToWav is a MP3 & Audio software developed by smart-butler.com. After our trial and test, the software is proved to be official, secure and free. Here is the official description for TextToWav:

Marydown Editor: Reads aloud or converts Texts to WAV/MP3/WMA files.

Reads aloud or converts texts to WAV/MP3/WMA files using Microsoft SAPI4/SAPI5. TextToWav is very useful when creating audio books.