You could have downloaded GhostReader Plus 2.5.2 for Mac from our software library for free. The program belongs to Productivity Tools. This Mac app was originally developed by AssistiveWare B.V.
From the developer:
GhostReader Plus provides the ultimate text to speech authoring solution allowing you to quickly and easily write, edit and markup your text with speech tags. Create beautiful audiobooks, lively podcasts or proofread your screenplay with all characters having their own voice. You can get full control over which language and voice to use at any moment or let the automatic language detection do that for you.
You may want to check out more Mac applications, such as GhostReader or Infovox iVox, which might be similar to GhostReader Plus.