Cepstral Swift - High quality Text-to-Speech (TTS) voices. Eighteen voices in six languages. The newest voice, David, is very smooth for reading news and browser content. Integrates 100% with Apple Speech Manager. Take advantage of Mac's support for multiple voices to speak different types of system messages. Requires OS X, 10.2 or higher. Cepstral voices are free to try, and $29.99 to buy.
Mac OS X Apps