rhvoice : A speech synthesizer for Russian (and similar) language ( https://github.com/Olga-Yakovleva/RHVoice )
svox : SVOX PicoTTS text-to-speech engine ( https://android.googlesource.com/platform/external/svox/+/master )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a activehome
For Paludis use this rsync : rsync://gentoo.zugaina.org/activehome-portage
If you have a problem : ycarus(-at-)zugaina.org