60
Marxism and FLOSS.
(lemmygrad.ml)
A Community for all leftists wanting to join and being part of a community that talks about Linux, Unix and the Free Software Community
I think Mint has LibreOffice included already.
If not, you have the Software Center app on Ubuntu and Mint. It's like the Windows Microsoft Store: a GUI to browse for installable software.
3rd option is to install it from the command line