Hardware : HP (ProLiant, Moonshot), Dell, SuperMicro, Soekris, Sun/Oracle SPARC, Silicon Graphics ;
datacenter infrastructure management ;
free UNIX systems:
GNU/Linux : Debian, Gentoo, Red Hat, Slackware, Ubuntu ;
FreeBSD ;
OpenBSD ;
shells ZSH et Bash ;
tmux, vim, sed, grep, etc. ;
networking:
firewalls: Packet Filter, pfSense, OpnSense, NetFilter/IPTables ;
VPN: IPsec, OpenVPN ;
SSH (OpenSSH, PuTTY),
DNS/DNSSEC (ISC Bind, NSD, Unbound), DHCP, PXE booting, etc. ;
remote console systems: HP iLo, IPMI, Sun LOM/ALOM/ILOM ;
load balancing: KeepAlived, HAProxy ;
Cisco solutions management ;
security :
general cryptography, TLS/SSL, certification authorities (PKI, CACert, Let’s Encrypt) ;
OpenSSL/LibreSSL, GnuPG ;
secret management (KeePass) ;
Network (Suricata) or host (rkhunter, OSSEC) intrusion detection/prevention ;
vulnerability assessment: OpenVAS ;
Web :
Apache HTTPd, Nginx, Varnish, HAProxy ;
PHP (PHP-FPM, APC, Zend OPcache, memcached), Ruby on Rails ;
Java (Oracle JDK, OpenJDK), Apache Tomcat ;
DotClear, WordPress, DokuWiki, MediaWiki, StatusNet, ownCloud, NextCloud, Tiny-Tiny RSS, Mattermost, webalizer, Awstats, Piwik, etc. ;
e-mail :
protocols: SMTP/SMTPS, POP/POPS, IMAP/IMAPS, SPF, DKIM ;
Dovecot, Postfix, ClamAV, OpenBSD spamd, GNU Mailman ;
databases : PostgreSQL, MySQL ;
monitoring : SNMP, Nagios/Centreon, PNP4Nagios, Shinken, Graphite ;
backup : Bacula, Bareos ;
configuration management : Puppet, Foreman, Rundeck, Ansible, AWX/Tower ;
development tools : Git, Gitlab, Mercurial, MantisBT, Jenkins.