DECTalk - the venerable text-to-speech system (think Stephen Hawking, or Moonbase Alpha) - seems to be available in source form: https://github.com/dectalk/dectalk There's a web demo: https://webspeak.terminal.ink/ While I've built it and run it quite successfully under Ubuntu, its licence is ... troubling. At best it's abandonware. At worst, there's an owner somewhere who hasn't found the github repo yet to shut it down. As such, it shouldn't be deployed without taking legal advice. [Karen - I know that DECTalk is a subject that matters to you. While this is interesting news, it likely doesn't mean that new, cheap DECTalk boxes will be hitting the streets soon. Some of the reasons include: * the licence: you need the permission of a possibly defunct company to use this software; * porting: the software doesn't seem to be set up to listen to a serial port and speak whatever comes in from that port; * availability of hardware: small Linux computers are in very short supply right now; and * sound quality: the built-in audio hardware on most single-board Linux computers sounds atrocious. Without an add-on amplifier/equalizer, I think you'd be horrified at the lack of fidelity.] cheers, Stewart