Translate Shell is a command-line translator powered by Google Translate (default), Bing Translator, Yandex Translate, and Apertium. It gives you easy access to one of these translation engines in your terminal.
LibreTranslateis an open-source machine translation API. Entirely self-hosted, offline-capable, and easy to set up. It doesn't rely on proprietary providers such as Google or Azure to perform translations.
DeepL Translator is a high-quality neural machine translation. Notice that the free version doesn't respect your privacy and uses the text to train and improve the neural machine and translation algorithms.