There are multiple screenreaders but their voices simply suck. KDEs espeak has way worse voices than Android eSpeak for some reason.
There is Thorsten Voice, a grest project that sounds really nice.
Not sure if he has a espeak dataset too.
Do you know any others?
Its essential for blind people, I dont think any blind person uses Linux if they have to hear these robot voices every day.
If you don't mind doing some development work, needing online connectivity, and paying for usage, AWS's Polly has some very good sounding TTS voices: https://aws.amazon.com/polly/
Hm, as a backup that could be okay, but not working offline /without being a huge privacy problem…
Just please don't use one of the kid voices for technical videos, a la babywogue and their GNOME development videos.