I'm looking for a text-to-speech converter, that

  • produces a wave or mp3 file (no real-time needed)
  • has no fundamental restrictions on commercial usage of the produced output
  • comes with female / male speakers for at least

    • English and
    • German language
  • puts output quality (pronunciation, tone and intonation) over ease of use (third-party product integration, nice GUI, etc.)

  • is gratis (in the ideal case)

There is no need for a whole integrated (and expensive) software suite.

Preferred environments (in descending order): JVM (binaries) > Windows > Linux console > web app

  • FYI: IMHO the answer does not meet the requirement "no fundamental restrictions on commercial use". See comment there – Thomas Weller Apr 13 '16 at 7:27

You could take a look at IVONA Text to Speech. It's not free but it does meet all of your other requirements:

  • Multiple voices (with additional voices available)
  • Multiple languages (with additional languages available)
    • American English
    • British English
    • German
    • Spanish
    • French
    • Italian
  • High quality (from my experience* anyway)

* One thing I will note, is that I have only used the IVONA Text to Speech voices for Android and I am basing my assessment of the quality level of the voices off this.

The software is available via their website and comes in a variety of shapes and sizes: for Windows, Android, as APIs for developers, as a Speech Server (for IVRs and the like), etc.

  • IMHO this does not meet the requirement "no fundamental restrictions on commercial use", since the terms indicate "The End User License Agreement does not allow for commercial use or distribution of audio created using the Ivona™ voices." – Thomas Weller Apr 13 '16 at 7:26

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