Free Excel alternative for Mac OS?

I need free alternative of Excel in Mac Os. I know that there is Open Office, but I am not sure if it is even supported anymore.

Any ideas?

By adding a table to Numbers, you can use Apple's replacement instead of a third party's. Numbers is free for anyone with an App Store account (which may require registration and a payment card - but no charge whatsoever).

Numbers is supported and designed to replace Excel for the majority of Mac users.

I use LibreOffice which is a really good alternative for MS Office. I've been using it for a couple of years now (on my Ubuntu earlier, now on MacOS).

If you need an online version of Office I recommend GoogleDocs. Full document edit history, collaborative editing, and ease of sharing.