Followed his successful VNSpeak TTS for Android, the author, Mr. Le Anh Tuan has continued to release several apps to address different needs of users, especially the VNSpeak TTS for NVDA and a SAPI-5 compliant one to be used with most Windows screen readers that support SAPI such as Jaws and NVDA. For more information, please visit http://www.vnspeak.com/ (in Vietnamese).
In addition, some other products are also rated highly by the visually impaired user community, include:
VNSpeak TTS English Vietnamese: a demo version supports language detection between English and Vietnamese.