Panopreter Basic reads text, text file, rft file, web page and word document with natural sounding voices, and converts the text and files into spoken audio files in wav and mp3 formats. It is a freeware text to speech application that's straightforward.
Here are some screenshots to illustrate the features and user interface of this application:
DSpeech
Balabolka
NVDA
NVDA Portable
Microsoft Dictate