• Nagios Addons - NRPE is an addon that allows you to execute plugins on remote Linux/Unix hosts. This is useful if you need to monitor local resources/attributes like disk usage, CPU load, memory usage, etc. on a remote host. Similiar functionality can be accomplished by using the check_by_ssh plugin, although it can impose a higher CPU load on the monitoring machine - especially if you are monitoring hundreds or thousands of hosts.
  • people.samba.org/people/ - Microsoft has always seen their Active Directory server implementation as the 'crown jewels', and have in the past fought extremely hard to try to prevent them having to document the protocols in a way that
    would allow for a competing implementation.