Systems : Ubuntu since 9.10, Ubuntu server LTS, Windows server 2003 - 2008, Windows XP-7-8, AIX 4.3-5.1,redhat 5-6, Centos 6, Debian . Network : DNS (Bind), dhcpd, NFS, FTP, SSH, openLDAP, Active Directory, TELNET, Samba, rsync. Application Servers : tomcat, jboss, Apache Jackrabbit, apache, lamp, nginx, varnish, HAproxy, pound proxy. Virtualisation : Oracle virtualbox, Vmware. Cluster : Vmware esxi 4.1-5.X, Vsphere,vCenterOrchestrator, Citrix xenserver 6.X, xencenter. Hosters : OVH, AWS, Innocore Mail :postfix, dovecot, roundcube, spamassasin, imapsync Security : OpenSSH, Iptables , OpenVPN, fail2ban. workflow et monitoring : ITPAM 3.1 , centreon/nagios, ntop, top, htop, munin. databases : Mysql, Oracle 11g, MariaDB. other : Git, svn, sugarCRM, openERP, asterisk, cron, joomla, scribus, GIMP, inkscape, sflphone, drupal, magento, Amazon EC2, Doker.