NaturalReader is one of the best free text to speech software in the category and there’s no doubt about it. Moreover, you can adjust the speech speed and volume effortlessly. While t allows you to input or copy text to its window, you can also convert text to WAV files that can be opened and played. A free an open source TTS program with an interface that’s simple and easy to navigate, eSpeak is a neat and compact program that can read your TXT and XML documents aloud in many different voices.