https://www.freeoffice.com/en/
https://www.freeoffice.com/en/freeoffice
https://www.freeoffice.com/en/freeoffice-comparison

https://www.freeoffice.com/en/download/applications
https://www.freeoffice.com/en/tips-and-tricks-linux
    # Ubuntu
    sudo -i
    wget -qO - https://shop.softmaker.com/repo/linux-repo-public.key | apt-key add -
    echo "deb https://shop.softmaker.com/repo/apt stable non-free" > /etc/apt/sources.list.d/softmaker.list
    apt update
    apt install softmaker-freeoffice-2021