eSpeak - eSpeak is a compact open source software speech synthesizer for English and other languages, for...
Balabolka - Balabolka is a Text-To-Speech (TTS) program.
NaturalReader - Main Feature: Full Common Functions: Read Text Files o Text files o MS Word files
From Text to Speech - Free web based Text To Speech (TTS) service. Convert online any English text into MP3 audio file.
eSpeak NG - eSpeak NG is an open source speech synthesizer that supports more than hundred languages and accents.
Mycroft Mimic - Mimic is a powerful TTS tool. Mimic is low-latency and has a small resource footprint. Its range of high quality voices also set it apart from other open source text-to-speech projects.