https://www.debian.org/distrib/
https://ubuntu.com/download/desktop
http://releases.ubuntu.com/releases/
http://old-releases.ubuntu.com/releases/
https://kubuntu.org/getkubuntu/
https://ubuntubudgie.org/downloads/
https://ubuntu-mate.org/download/
https://linuxmint.com/download.php
https://elementary.io/ has an optional donate option, just choose
then insert 0
https://getfedora.org/en/workstation/download/
https://fedoraproject.org/wiki/Releases/Rawhide#Using_Rawhide
https://getfedora.org/en/iot/download/
https://getfedora.org/en/server/download/
https://silverblue.fedoraproject.org/download
https://www.redhat.com/technologies/linux-platforms/enterprise-linux
ftp://archive.download.redhat.com/pub/redhat/linux/
https://manjaro.org/download/#Community
https://osdn.net/projects/manjaro-archive/
https://get.opensuse.org/tumbleweed/
https://get.opensuse.org/leap/
https://www.suse.com/download/sled
https://www.suse.com/download/sles
https://redcorelinux.org/download
https://archlinux.org/download/
https://artixlinux.org/download.php
https://www.gentoo.org/downloads/
http://www.slackware.com/getslack/
https://slackware.uk/people/alien-current-iso/slackware-current-iso/
https://slackware.uk/people/alien-current-iso/slackware64-current-iso/