A supplementary show to Jeroens episode HPR2792 :: Playing around with text to speech synthesis on Linux.
I found two addional options. The first is mimic
# dnf info mimic Summary : Mycroft's TTS engine URL : https://mimic.mycroft.ai/ License : BSD Description : Mimic is a fast, lightweight Text-to-speech engine developed by Mycroft A.I. : and VocalID, based on Carnegie Mellon University’s FLITE software. Mimic takes : in text and reads it out loud to create a high quality voice. Mimic's : low-latency, small resource footprint, and good quality voices set it apart : from other open source text-to-speech projects.
And the second is gTTS which is a interface to the google TTS api.