Here you can find my Nagios (and compatible) monitoring plug-ins.

check_cisco_nexus : monitor Cisco datacenter switch (CPU, memory and sensors)
check_msa_hardware : monitor HP MSA 2xxx storage bays sensors (Voltage, temperature, capacity and overall status)
check_mirapoint : monitor Mirapoint messaging system, tested with Razorgate and Messaging backends. check_diskstat : monitor linux IO activity