• Web servers: Apache, IIS. • Firewall configuration: APF, CSF. • FTP servers: Pro-ftp, Pure-ftp, Sftpd. • Mail Transfer agent (MTA): Exim, Smarter mail and MailEnable. • POP3/IMAP: pop3d, courier. • Database Servers: MySQL and MSSQL server. • Control Panels: cPanel, Parallels Plesk, Virtuozzo OnApp power panel. • Monitoring and alerting: Nagios, Mytop. • Security: Antivirus software for mail servers, SPAM filtering by means of DNS blacklists. • custom rules, SPF, Spamassassin, domain keys.