The NET-SNMP (formerly UCD-SNMP) package contains various tools relating to the Simple Network Management Protocol including an extensible agent, an SNMP library, tools to request or set information from SNMP agents, tools to generate and handle SNMP traps, a version of the unix 'netstat' command using SNMP and a Tk/perl mib browser. It was originally based on the Carnegie Mellon University SNMP implementation (version 220.127.116.11), but has been greatly enhanced, ported and fixed and barely resembles the original package anymore.
KernScope is a simple tool that parses the contents of /proc or /sys entries on a Linux system and graph their values. It is intended for developers, admins, or the curious and aids with the understanding of system performance and behavior. Users can select any integer values for graphing with a simple syntax.