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Spelling and grammar corrector?
(lemmy.ml)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
And language tool is a great option! I use it for many different languages and support for it can be found in many places. Even Thunderbird has first class support for it, these days!