As you can deduct from its name, the software is listed and provided for free. I've checked its official website and although it's doing what it says, Free Voice to Text is listed on a website where everything is free which looks odd and suspicious at the same time. Download the application, but be very careful when the installation takes place. Have your antivirus installed and enabled, then proceed. As for writing and speaking, I believe there are far better tools out there developed.
You could try as alternative Free Natural Voice Text to Speech Reader. Access the page from Software Informer to obtain additional information.