Must-Have Administration Tools?

[Andrew Smith <arse () somethingentertainment co uk>]

I am considering putting a FreeBSD machine onto the internet and 
offering out free SSH accounts, mainly to give myself first hand 
experience at server administration.
I'm not new to BSD, but i'm no where near good at it,
so my question is are: What are the 'must have' have 
security/administration/monitoring/general tools or documents that i 
install or should read before doing so?
I accept that my server could easily be 'cracked' during my its time 
connected to the internet, this does not particularly bother me, i just 
want to learn..

Thanks for any replies,

Andrew,

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