You can download the official "Free HD Video Converter Factory" directly from the WonderFox website to try the basic features safely.
If you don't want to pay for the Pro version, these tools are open-source, safe, and professional-grade: Download AbbasPC Video Converter Factory Pro rar
Most people don't realize VLC has a built-in "Convert/Save" feature that handles almost any file type. You can download the official "Free HD Video