Here is a complete collection of the most popular software repositories:
CentOS
http://mirror.centos.org/centos/Fedora
https://dl.fedoraproject.org/pub/fedora/linux/Open Suse
https://download.opensuse.org/repositories/Open Solaris
https://mirror.opencsw.org/opencsw/Open AIX
ftp://www.oss4aix.org/HP-UX
http://hpux.connect.org.uk/hppd/packages.htmlUbuntu
https://archive.ubuntu.com/ubuntu/Debian
https://ftp.debian.org/debian/Alpine
https://dl-cdn.alpinelinux.org/Alma
https://repo.almalinux.org/Rocky
https://download.rockylinux.org/pub/rocky/Gentoo
https://packages.gentoo.org/Manjaro
https://repo.manjaro.org/Arch
https://archlinux.org/packages/Remi Repository
https://rpms.remirepo.net/Epel Repository
https://dl.fedoraproject.org/pub/epel/Perl Modules (MetaCPAN)
https://metacpan.org/Perl Modules (CPAN)
https://www.cpan.org/Python Packages (PyPI)
https://pypi.org/Nginx Repository
https://nginx.org/packages/Open WRT Repository
https://downloads.openwrt.org/releases/ZABBIX Repository
https://repo.zabbix.com/Raspberry Pi Repository
https://downloads.raspberrypi.com/
PHP Package (Packagist)
https://packagist.org/