free hIDS, or system assessment tools

["Fahad Al-Suwais" <suwaisfa () alrajhibank com sa>]

Dear...

As I know snort is nIDS, nessus is network assessment tool

But 
Is there any free System Assessment tools for windows and *nix
Is there any free System or host IDS for windows and *nix

Please if you know any products let me know

Regards,


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