Open source software

Can someone provide the name of some open source software that can assist with web utilization, os utilization virtualization and security vulnerabilities. It does not have to be all the same software. This is for linux and windows OS.
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nociSoftware EngineerCommented:
lynis - auditing system
icinga + nagios-plugins monitoring including utilisation
collectd + some kind of visualisor (CGP f.e.) utilisation of various tools on detailed level.

subsicribe to some mailling lists like security-focus  (and family)  a lot of announcements there.

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Robert LemMrCommented:
Try Check_Mk. I use it to find any problem on my network. Its a big system and  has a lot of add-ons but works well. You can use the Check_MK Raw Edition, which is free.
Sajid Shaik MSystem AdminCommented:
there are somany opensource network monitoring tools avail

some of the best with the comparision you can check in the following link

if want tp use the best easy to use with best features one of the best is the PRTG

all the best
For Monitoring, opsview for vulnerability assessment use OpenVAS
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