I wrote a Dart package for speech-dispatcher, enabling TTS on Linux. It also works with Flutter for Linux. The package supports most features of speech-dispatcher, with additional support for less commonly used functionality like history coming soon. It still needs broader testing, so feel free to open any issues you encounter. My hope is that one of the TTS packages for Flutter will start using it to add Linux support, as most, if not all, currently don't support Linux.
You can find the package on GitHub at github.com/the-byte-bender/dar… and on pub.dev at pub.dev/packages/dart_speechd.
GitHub - the-byte-bender/dart_speechd: Dart bindings for speech dispatcher, for text to speech on linux.
Dart bindings for speech dispatcher, for text to speech on linux. - the-byte-bender/dart_speechdGitHub