Sonatype Nexus Repository

CentOS-7 (yum) [centos-group]:
http://mirrors.rit.edu/epel/7/x86_64/ - epel
http://mirror.yandex.ru/centos/7/os/x86_64/ - centos-base
http://mirror.yandex.ru/centos/7/updates/x86_64/ - centos-updates
http://mirror.yandex.ru/centos/7/extras/x86_64/ - centos-extra
https://download.docker.com/linux/centos/7/x86_64/stable - centos-docker-engine

Fedora (yum):
https://mirror.yandex.ru/fedora/linux/ - fedora release
https://archives.fedoraproject.org/pub/archive/fedora/linux/ - fedora-archive

Debian (apt):
http://ftp.ru.debian.org/debian - debian-general (distribution: buster)
http://security.debian.org/debian-security - debian9-security (distribution: stretch)

Ubuntu (apt):
http://archive.ubuntu.com/ubuntu/ - ubuntu-bionic (distribution: bionic)

Chocolatey (nuget):
https://chocolatey.org/api/v2/ - Chocolatey-proxy (Metadata query cache age: 36000)

Raw:
https://downloadarchive.documentfoundation.org/libreoffice/old/ - LibreOffice

Other:
https://repository.jboss.org/nexus/content/groups/public-jboss/ - jboss (maven2, strlct)
https://repo1.maven.org/maven2/ - central (maven2, permissive)