is there an offline good program for text to speech for german,french,spanish,english? and no, festival and espeak are not what i would consider good.

the at&t website with text to speech as audio file which were used in these anonymous publications are good, but not espeak. if i had sth like this for european (and russian and arab languages) as open source standalone, i would be happy :(

The project is called Larynx, and it is amazing: https://github.com/rhasspy/larynx/

I waxed lyrical about it recently in this thread about private alternatives to Alexa: https://news.ycombinator.com/item?id=29562526

I can only vouch for the quality/variety in English but it does note support for 50 voices over 9 languages, including all the first group of languages you mentioned, and also Russian. (I've "played" with all those languages to test them but can't really vouch for how a native speaker/listener might find it. :D )

It is miles ahead of any of the other Free/Open Source TTS solutions I've tried, including the ones you mentioned.

(It's still synthesized speech but the output quality is so good and the project is still extremely early days.)

And there's a range of options in accent & gender--which are in general sorely lacking in other FLOSS TTS options. (In terms of licensing, some voices are licensed more freely than others but the majority are without significant restriction.)

I like Larynx so much that I've been working on an editor for it to assist in "auditioning" & recording speech in a narrative context, e.g. game/film pre-viz.