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Publisher · Open source

eSpeak

eSpeak is a compact open-source formant speech synthesizer created by Jonathan Duddington; its maintained successor, eSpeak NG, supports more than 100 languages and accents. Both are licensed under the GNU GPL version 3, with eSpeak NG under version 3 or later.

Licensing at a Glance

  • Open source

  1. eSpeak is a compact open source software speech synthesizer for English and other languages, for Linux and Windows, using a formant synthesis method.[1]

  2. The eSpeak text-to-speech project is licensed under version 3 of the GNU General Public License.[2]

  3. eSpeak NG is a fork of eSpeak that supports more than 100 languages and accents and is released under the GPL version 3 or later.[3]

  4. The getopt compatibility implementation that eSpeak NG uses on Windows comes from NetBSD and is licensed under a 2-clause BSD licence.[4]

Products

  • eSpeak
  • eSpeak NG

References

  1. eSpeak: Speech Synthesizer · espeak.sourceforge.net · retrieved 2026-09-27
  2. eSpeak license · espeak.sourceforge.net · retrieved 2026-09-27
  3. eSpeak NG README · raw.githubusercontent.com · retrieved 2026-09-27
  4. eSpeak NG README · raw.githubusercontent.com · retrieved 2026-09-27
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