System load average, active processes and memory allocation

monitorix

lightweight system monitoring tool

Monitorix is a lightweight tool that allow you to gather and display system metrics.
neomutt with "neon" color scheme with single mailbox setup

neomutt

command line mail reader based on Mutt, with added features

Neomutt supports all the features that are supported by Mutt, including POP and IMAP support, SSL encryption and SASL authentication, threading and GPG support.
Dark Matter

splash

Visualisation tool for Smoothed Particle Hydrodynamics simulation

This (formerly SUPERSPHPLOT) is a visualisation tool for output from (astrophysical) simulations using the Smoothed Particle Hydrodynamics (SPH) method in one, two and three dimensions. It is written in Fortran 90 and can utilise the PGPLOT graphics subroutine library to do the actual plotting. It is based around a command-line menu structure but utilises the interactive capabilities of PGPLOT to manipulate data interactively in the plotting window.
Tiny utilities for small and embedded systems

busybox

Tiny utilities for small and embedded systems

BusyBox combines tiny versions of many common UNIX utilities into a single small executable. It provides minimalist replacements for the most common utilities you would usually find on your desktop system (i.e., ls, cp, mv, mount, tar, etc.). The utilities in BusyBox generally have fewer options than their full-featured GNU cousins; however, the options that are included provide the expected functionality and behave very much like their GNU counterparts.
Crossplatform tool for getting screenshots

screengrab

Crossplatform tool for getting screenshots

Screengrab working in Linux and Windows. The program uses Qt and is independent of any desktop environment. Main features: * Get desktop screenshots * Get active window screenshots * Get secreenshots of desktop selection area * Copy screenshot to clipboard * Saving your image files in formats PNG or JPEG or BMP * Ability to set delay in getting screenshots (from 1 to 90 seconds)
tool to dump x86 CPUID information about the CPU(s)

cpuid

tool to dump x86 CPUID information about the CPU(s)

cpuid dumps detailed information about the CPU(s) gathered from the CPUID instruction, and also determines the exact model of CPU(s). It supports Intel, AMD, and VIA CPUs, as well as older Transmeta, Cyrix, UMC, NexGen, Rise, and SiS CPUs.