These lists are not complete. They're not intended to be complete.


1. Free/open source software that unfortunately doesn't work with IPv6 out of
the box

Well, this just sucks.


* All DJB-ware (DJB doesn't like IPv6: http://cr.yp.to/djbdns/ipv6mess.html)
  * djbdns      http://www.fefe.de/dns/
  * dnscache
  * ucspi       http://www.fefe.de/ucspi/
  * qmail

* fail2ban

* MySQL
    http://forge.mysql.com/worklog/task.php?id=798
    "Status: On-Hold — Priority: Low"  Meh.

* OpenVPN
    http://openvpn.net/index.php/open-source/faq/77-server/287.html
    "Currently, there's limited support for IPv6."

* Perl
    http://search.cpan.org/~umemoto/Socket6-0.23/
    http://search.cpan.org/~sullr/Net-INET6Glue-0.4/


2. Software that handles IPv6 well

Non-GUI

* cURL
* OpenSSH
* Irssi (doesn't default to ipv6 yet)
* lftp
* lighttpd
  * bug in mod_extforward, patch at http://redmine.lighttpd.net/issues/1889
* Mutt
* PostgreSQL
* Pound (http load balancer)
* Wget

GUI

* Every (?) browser


3. Software that may come in two flavors

* iptables, ip6tables
* nc, nc6
* ping, ping6
* traceroute, traceroute6
* tracepath, tracepath6




More at
http://ipv6wiki.net/wiki/Portal:Software
http://www.deepspace6.net/docs/ipv6_status_page_apps.html