FYI re: Mimic 3: the main developer Michael Hansen (a.k.a synesthesiam) (who also previously developed Larynx TTS) now develops Piper TTS (https://github.com/rhasspy/piper) which is essentially a "successor" to the earlier projects.
IIUC ongoing development of Piper TTS is now financially supported by the recently announced Open Home Foundation (which is great news as IMO synesthesiam has almost single-handed revolutionized the quality level--in terms of naturalness/realism--of FLOSS TTS over the past few years and it would be a real loss if financial considerations stalled continued development): https://www.openhomefoundation.org/projects/ (Ok, on re-reading OHF is more generally funding development of Rhasspy of which Piper TTS is one component.)
IIUC ongoing development of Piper TTS is now financially supported by the recently announced Open Home Foundation (which is great news as IMO synesthesiam has almost single-handed revolutionized the quality level--in terms of naturalness/realism--of FLOSS TTS over the past few years and it would be a real loss if financial considerations stalled continued development): https://www.openhomefoundation.org/projects/ (Ok, on re-reading OHF is more generally funding development of Rhasspy of which Piper TTS is one component.)