====== Zammad ======

Zammad is a helpdesk system, which allows you to work on customer requests with multiple persons. However the installation is a bit tricky...

  * Use a plain Linux system, if Plesk is installed it will not work (at least not without serious pain)
  * When installing elastic search at least on Ubuntu, it will be required to regenerate the keystore. Delete /etc/elasticsearch/elasticsearch.keystore and then run "/usr/share/elasticsearch/bin/elasticsearch-keystore create"