I’ve been using LibreOffice for a while now, and while I do enjoy it, its spelling/grammar checking are hit or miss more often than not.

I’ve been using WritingTool for my spelling and grammar, and it seems to work well sometimes, but others it gets things wrong. I have had the (un)fortunate pleasure of having to use Microsoft Office for work reasons, and while I dislike most of what Office provides, to me at least, its spelling/grammar check seems better than WritingTool (Providing suggestions WritingTool doesn’t, better grammar & proper noun detection, etc).

I’m looking for any good alternatives to WritingTool or ways to improve its checking behavior/accuracy. If the later, what rules or settings do you use to make it perform better?

If it’s necessary to know, I’m using Arch Linux, though I’m sure Extensions for LibreOffice would work on any OS.