Extra Voices

For obvious legal reasons, I cannot distribute certain voices. However, you can obtain a copy yourself if you fulfill the requirements from the owners. :)

Non-Commercial Use Scottish Voices - Heather (English), Stuart (English), and Ceitidh (Gaelic)
To obtain these voices free, you must have a valid Scottish school, public sector, College or University email address or home use for a school pupil
https://www.thescottishvoice.org.uk/Home/

Hebrew Text-to-Speech Voice Program:
To obtain a free license, you must be a student of Tel Aviv University in Israel and file the university for disability.
https://m.tau.ac.il/cc/helpdesk/general/kolfix/kolfix.html