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There are many security related sites and security utilities knocking around the 'net but some of the better ones (in my opinion) are listed below. (All links are to sites unrelated to this site).
NMAP - "The Network Mapper"
NMAP is considered by many to be one of the best (if not the best) free security scanners. It is capable of scanning hosts and subnets using various protocols (TCP, UDP, ICMP etc.). It will locate services running on hosts (TCP, UDP, RPC etc.), attempt operating system (OS) identification and numerous other useful things.
Related Links: ;

John the Ripper
There are many "password crackers" out there but this is my favourite. It is fast and configurable and available on many operating systems and platforms. It's main purpose is to detect weak *NIX passwords so that you can better educate your users and get them to choose strong, difficult to guess passwords.
Related Links: http://www.openwall.com/john/ ;