PROBESYS, Grenoble, France
ProbeSys is a company dedicated to free software services. We are using Debian on our desktops and we are using it to operate all our customers' servers; which run Posfix, openLDAP, squid, backupPC, GLPI, OCS, heartbeat, Samba, Nagios, Apache, eGroupWare, wifidog, etc. We've chosen it for its security and stability.