More Voices For Narrator

Narrator uses all voices which are available from macOS by default. But there is more...

Voices from Cepstral

There is a whole bunch of English and American voices at Cepstral. The trial period is not time-limited; It never expires. However, a voice will interject reminder messages into the audio output until you purchase a valid license key for it. Each single voice has a price of 29.95 USD at Cepstral. [State: 2010-11-30]

Cepstral voices: Try | Download | Buy

Voices from acapela Infovox iVox

The acapela Group offers Infovox iVox which enhances the voices for macOS at a high quality. (These voices can be used in Narrator and other voice supporting applications.)

These voices are distributed by AssistiveWare who have also developed the alternate product [GhostReader] which you can get here, too. There is a whole bunch of English and American voices available. The bundle price is 99 EUR for a whole voices package. [State: 2010-11-30]

Infovox voices: Try | Download | Buy