Switchmap is a Perl program that creates HTML pages that show information about a set of Cisco Ethernet switches. It uses SNMP to gather data from a list of switches, given the list of IP addresses and names. The output pages show, for each port, the status, duplex, VLAN, speed, and what's connected to the port (MAC address, IP address, DNS name). The pages help network engineers quickly see switch information.
Panoptes is a scalable, extensible network and host monitoring tool. It includes a dynamic Web management interface based on the Dojo toolkit. It monitors SNMP, TCP port availability, ICMP, HTTP response and content, and SSL certificates internally. It supports monitoring anything else via shell scripts. It also includes a packet capture tool for discovery of hosts, port, and OS.
vded is a simple REST-type method for tracking deltas of ever-increasing values (although it handles resets, etc., pretty well). It is meant to accept submissions of values which increment, then determine the delta between that value and its predecessor, as well as figure the rate over time.