The most popular spellchecking library.
One can implement Huntspell which is what all browsers use (for example when typing in text areas). Is very simple and is C++.
Style and Grammar Checker for 25+ Languages
The last addition I did was LanguageTool, works fine but has a rate limit of 20 queries per minute (which is more than enough). One can potentially download the server and run it locally for unlimited queries, but I don't think that's necessary.
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Language Tool – open-source Grammarly Alternative
9 projects | news.ycombinator.com | 26 Jul 2022
Autocorrect anything with Google as a go-to spell check
3 projects | reddit.com/r/AutoHotkey | 5 Feb 2023
Looking for a certain kind of app
1 project | reddit.com/r/languagelearning | 3 Feb 2023
grammarly-like websites for German?
1 project | reddit.com/r/germany | 3 Feb 2023
Got my first OE paycheck.
1 project | reddit.com/r/overemployed | 28 Jan 2023