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What is a good free linux server monitor package that has a web gui?

I have multiple servers co-lo and I want to setup an additional screen for monitoring their up-time, services, memory, drive space, bandwidth...etc. If possible all on one screen if possible. Just wondering what other admins like to use for this.

Public Comments

1. The most popular and probably industry standard one is Nagios Beats other software in this category hands down. Also check out RRD tool and Cactii