What are some alternatives?
When comparing Acapela TTS and eSpeak, you can also consider the following products
NaturalReader - Main Feature: Full Common Functions: Read Text Files o Text files o MS Word files
Balabolka - Balabolka is a Text-To-Speech (TTS) program.
TextAloud - NextUp.com develops Windows text to speech (TTS) software applications like TextAloud that let your...
ReadSpeaker - Online Text to Speech by ReadSpeaker.
Simple TTS Reader - Simple TTS Reader is a small clipboard reader. Simply copy any text, and it will be read aloud.
From Text to Speech - Free web based Text To Speech (TTS) service. Convert online any English text into MP3 audio file.