NNTP.

Installing INN2 on Debian.

$ sudo apt-get install inn2
$ cat /etc/news/inn.conf
...
mta:                    "/usr/sbin/exim4 -oi -oem %s"
organization:           "My HOME nntp"
pathhost:               my.org.int
domain:                 org.int
maxartsize:             10000
maxconnections:         10
...

$ cat /etc/news/readers.conf
...
auth bifit {
     hosts: "*.org.int, 192.168.1.0/24"
     default: "<LOCAL>"
}
access bifit {
    users: "<LOCAL>"
    newsgroups: "comp.*"
    access: RP
}
...

$ sudo /etc/init.d/inn2 reload
$ sudo ctlinnd newgroup comp.general y gavenko@org.int
$ sudo ctlinnd newgroup comp.general.lang y gavenko@org.int

$ su
$ echo 1 > /proc/sys/net/ipv6/bindv6only

Public NNTP server.

http://www.eternal-september.org/

Private project provides free access to text-only Usenet. Free reading and posting after registration.

http://news.aioe.org/

Public news server provides free reading and has 25 per IP per day posting limit.

https://wiki.debian.org/UseNet

linux.debian.* - gateways to debian-*@lists.debian.org.

Public NNTP archives.

https://groups.google.com/

Biggest usenet archive.

http://www.derkeiler.com/

USENET archive since 2001.

http://marc.info/

Very big mailing list archive.