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	A free Unix-type operating system		The Xen hypervisor, a powerful open source industry standard for virtualization.
	Professional Linux supplier		Inserted system that is based on Linux, usually used in router.
	Lotus is produced by IBM. Actually, Domino/Notes is the world standard of groupware.		Aastra is a leading global communications company providing solutions for small and medium sized businesses, as well as large mission-critical enterprise environments.
	Nagios is application system of monitoring network. It monitors the host and the network, and informs you when it becomes worse.		Powerful free using anti-virus software.
	Plone Content Management System		Asterisk is the world's leading open source PBXi, telephony engine, and telephony applications toolkit.
	Openswan is an implementation of IPsec for Linux.		oracle database
	It is Wietse Venema's mailer that started life at IBM research as an alternative to the widely-used Sendmail program.		MySQL database
	Cyrus is a highly scalable enterprise mail system.		A Mail Virus Scanner