memtester is a user-space utility for testing the memory subsystem in a computer to determine if it is faulty. It does a good job of finding intermittent faults and non-deterministic faults. It has many tests to help catch borderline memory. memtester should compile and run on any 32- or 64-bit Unix or Unix-like system.
picocom is a minimal dumb-terminal emulation program. It is ideal for embedded systems since its memory footprint is minimal (less than 20K, when stripped). Apart from being a handy little tool, the source distribution includes a simple, easy to use, and thoroughly documented terminal-management library.
IPMItool is a simple command-line interface to systems that support the Intelligent Platform Management Interface (IPMI) specification. It provides the ability to read the SDR and print sensor values, display the contents of the SEL, print FRU information, read and set LAN configuration parameters, perform remote chassis power control, and act as a serial over LAN client. It can work with IPMI-over-LAN (both version 1.5 and 2.0) interfaces as well as the system interface provided by a kernel driver such as OpenIPMI.
memtest86+ is a memory tester which is based on memtest86 v3.0, and provides an up-to-date version of this useful tool, which aims to be as reliable as the original. It has been fixed to work on AMD64 systems, and also properly detects all current CPUs and motherboard chipsets. It supports ECC polling for AMD64, i875P, and E7205, and displays some useful settings for the most popular chipsets.
SimMon is a cross platform monitoring tool which runs on almost any OS that supports the Java Virtual Machine 1.4+. Monitoring is done through the execution of existing monitoring scripts (Perl/VBS) or existing shell commands. Currently monitoring scripts are available for Solaris, Linux, Mac OS X, and Windows based systems. Network devices can be monitored via the integrated SNMPv1 scheduler.
cpuburn is is a set of programs that load x86 CPUs as heavily as possible for the purposes of system testing. FPU and ALU instructions are coded in an endless loop in an attempt to maximize heat production from the CPU, putting stress on the CPU itself, the cooling system, the motherboard (especially voltage regulators), and power supply. The tests may damage undercooled, overclocked, or otherwise weak systems and cause data loss or permanent damage to electronic components.