Libreoffice their latest blogpost is from the 20th of August 2025. There have been a few releases in the past few months as well.
Openoffice their latest ( Apache Openoffice 4.1.15 ) was released almost 2 years ago ( December 2023 ).
Libreoffice seems like a more recent, better supported tool over Openoffice which hasn't seen any updates since 2023 according to their own website.
I'm on my phone, so I didn't search extensively. But I think that also plays a role in why there's a much larger fanbase for libreoffice rather than Openoffice.
I've no recent experience with either so I can't comment on how well either works.
Edit: I looked up the wrong one. My statement remains correct w.r.t. Openoffice, but they mentioned Onlyoffice which is a different product.