Pógódnośenja za Grammar and Spell Checker - LanguageTool
Grammar and Spell Checker - LanguageTool wót LanguageTooler GmbH
Pógódnośenja wót alissakvashina
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wót alissakvashina, pred 5 letiQuite good for English. Also one of the best checkers for Russian. There are some issues, but they all can be reported on their github and they do fix those.