LanguageTool is an add-on to LibreOffice and OpenOffice, allowing you to use the open revision tools of LanguageTool.org. This allows you to check the grammar, punctuation and find many errors that the traditional dictionary will not capture. LanguageTool allows you to check the spelling of words, finds russimisms, tribalisms, controls the spelling of small and capital letters, finds many types of grammatical and punctuation errors, lexical errors, word variations, Polish typographic norms and many more.

In the settings of the extension you can find details and, if necessary, disable the possibility of searching for specific errors. LanguageTool integrates well with built-in spell-checking, highlights errors in blue LanguageTool supports Polish, English, German and many others - in total there are more than 20 of them. You can also specify the path to the n-gram directory in the extension settings.