LibreTranslate is a free and open source machine translation API. It can be downloaded, runs offline and is described as easy to set up, allowing users to run their own API server in a few minutes.
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Dialect is a translation app for GNOME. It supports translation providers including Google Translate, DeepL, Kagi Translate, Microsoft Translator, Yandex Translate, LibreTranslate and Lingva Translate. Its features include translation history, automatic language detection, text to speech and clipboard buttons.
Mozhi is an alternative frontend for many translation engines, initially made as a maintained fork or rewrite of SimplyTranslate. The README lists supported engines Google, Reverso, DeepL, LibreTranslate, Yandex, MyMemory and DuckDuckGo, and notes the engine code has been split into a separate repository. The author states a focus on the API and engines, with a CLI and webapp planned.