Raven's System Stats allows users to collect detailed information about an operating system, including kernel architecture, distro, operating system, kernel version, glibc version, name of login shell, number of CPUs, CPU description, hyperthreading support, CPU MHz, CPU cache, bogomips, used and total RAM, used and total swap, filesystem size and type, uptime, unique users logged in, total login shells, currently running processes, total processes since bootup, load average, X resolution, and the number of X servers running.
jdiagnostics is a library of routines for inspecting the state of a JVM and building a support bundle. It makes it easy to diagnose issues with classpaths, resources, serviceloaders, versioning, XML parsers, and so forth. It has no dependencies, and is an essential library to build into any infrastructure application.
The Linux Duracell CPU load monitor is a program that drives a Duracell or Energizer on-battery tester to display the CPU load of a system. It can be easily adapted to display other things that can use a slow bar graph kind of display that varies between 0% and 100%. Instructions to hack a AA-battery tester and turn it into a computer display are included in the distribution.