Libretranslate is FOSS and you can even selfhost it.
Then there is Translate you, it uses multiple engines 🐱
similar to these, there is monocles translator (monocles translation a safe and private translator)
Monocles Translator is a fork of Translate You and I wasn't able to tell what it changes.
yes, they seem to be identical 🤷
My opinion is the best translation program:
Firefox Translations provides automated translation of web content. Unlike cloud-based alternatives, translation is done locally, on the client-side, so that the text being translated does not leave your machine. Firefox Translations was developed with The Bergamot Project Consortium. https://addons.mozilla.org/en-US/firefox/addon/firefox-translations/?utm_source=addons.mozilla.org&utm_medium=referral&utm_content=search
Desktop version of Bergamot MT: https://translatelocally.com/ translateLocally is a privacy focussed machine translation application which translates content privately and securely on the user's own computer.
Not open source but privacy friendly:
Brave Translate (Lingvanex) https://support.brave.com/hc/en-us/articles/8963107404813-How-do-I-use-Brave-Translate-
https://www.deepl.com/translator has web interface and standalone application for any system
not open source, but works really well
Lingva Translate is a privacy friendly front-end for Google Translate (similar to invidious for YouTube): https://github.com/TheDavidDelta/lingva-translate
Ex. pub instance: https://lingva.lunar.icu/
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