English to Spanish Translator Pro VS LibreTranslator

Google Translate - Google's free service instantly translates words, phrases, and web pages between English and over 100 other languages.

BabelNet - The largest multilingual encyclopedic dictionary and semantic network

DeepL Translator - DeepL Translator is a machine translator that currently supports 42 language combinations.

Linguee - English Dictionary and Translation Search with 1,000,000,000 example sentences from human translators. Languages: English, German, French, Spanish, and Portuguese

Mate Translate - Ultimate translation app for Mac, iOS, Chrome and many more

LibreTranslate - LibreTranslate is a free and open-source and self-hostable machine translation server. It also has a public instance designed for personal or infrequent use.