Ledcontrol is a program that shows information on the normally-unused LEDs on your keyboard. You can configure it to show virtually any TRUE/FALSE condition or arbitrary value accessible. Features include blinking LEDs, priority levels, user-made animations, a GTK+ interface, etc. Ledcontrol works both in X and on a text console.
CCMATH is a mathematics library, coded in C, that contains functions for linear algebra, numerical integration, geometry and trigonometry, curve fitting, roots and optimization, Fourier analysis, simulation generation, statistics, special functions, sorts and searches, time series models, complex arithmetic, and high precision computations.
KMatplot is an Origin-like tool for plotting data sets in either two or three dimensions. It can plot many ordinary types of 2D plots, including pixmaps, contours, and 3D surfaces. It offers a full WYSIWYG mode with many graphs on a single page and a simple command interface for Octave and Scilab.
Threads is a library designed to make threading under C++ simpler. It provides a "pthread" class, with an abstract method called "thread". It also provides classes for mutual exclusion of parallel processes and condition signalling, and a semaphore class that comes in handy when synchronizing constructor and threaded method. The aim of the threads library is to provide a simple, yet powerful means of threading applcations, and to provide shared memory and process scoping to C++ programs.