Ganglia is a scalable distributed monitoring system for high-performance computing systems such as clusters and Grids. It is based on a hierarchical design targeted at federations of clusters. It leverages widely used technologies such as XML for data representation, XDR for compact, portable data transport, and RRDtool for data storage and visualization. It uses carefully engineered data structures and algorithms to achieve very low per-node overheads and high concurrency. The implementation is robust, has been ported to an extensive set of operating systems and processor architectures, and is currently in use on thousands of clusters around the world. It has been used to link clusters across university campuses and around the world and can scale to handle clusters with 2000 nodes.
ifGraph is a set of Perl scripts created to help network administrators to visualize network flow on a daily, weekly, monthly, and yearly basis. The graphics are created with RRDTool, and it shows bytes/bits (in/out) and errors for each interface.
upnp2mrtg is a add-on for the MRTG (Multi Router Traffic Grapher). upnp2mrtg is a command line tool written in shell to gather statistics from an upnp enabled FritzBox DSL router.
RRD is the acronym for Round Robin Database. It is a system to store and display time-series data (i.e. network bandwidth, machine-room temperature, server load average).