+ - [Debian](https://www.debian.org/)
+ - [Postfix](http://www.postfix.org/)
+ - [Mailman](http://list.org/)
+ - [Schleuder](https://schleuder2.nadir.org/)
+ - [SpamAssassin](https://spamassassin.apache.org/)
+ - [BIND](https://www.isc.org/downloads/bind/)
+ - [Apache](https://httpd.apache.org/)
+ - [Ikiwiki](https://ikiwiki.info/)
+ - [Git](https://git-scm.com/)
+ - [Keyringer](https://keyringer.sarava.org/)
+ - *et encore de nombreux autres…*