What text to speech voice plugins are available with Captivate 7?

I have Captivate 5.5 at the moment but we need to upgrade in order to add more video editors. At the moment, we use Paul from the Loquendo plugin but I'm worried as I can't seem to find this plugin for Captivate 7.

Has anyone else got any information on other plugin options for text-to-speech in Captivate 7 free or paid?