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If you're a system or network administrator, you need to know the status of your systems so you can optimize performance and head off potential problems. Thankfully, plenty of tools are available to help you stay vigilant.
Here are five free system and/or network monitors that do as much or more than the pricier solutions.
Note: If you'd prefer to view this information as a blog post, check out this entry in our Five Apps blog.
Observium is "an autodiscovering PHP/MySQL/SNMP-based network monitoring [tool]." It focuses on Linux, UNIX, Cisco, Juniper, Brocade, Foundry, HP, and more.