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I use open source Language Tool (https://github.com/languagetool-org/languagetool) within my not-open-source sublime and it works great.
You can probably find a foss way to use it:
LanguageTool’s core functionality is open source. Anyone can set up their own LanguageTool server locally or in the cloud. Furthermore, we are looking for contributions to further improve our proofreading technology.
I use it with LibreOffice.