Xoscope

Especially helpful for educators teaching lessons on sound, Xoscope turns any Linux PC into an oscilloscope. It can accept audio input from up to eight different channels.

Xiphos

Open Source Bible Study Tool

Xiphos (formerly known as GnomeSword) is a Bible study tool written for Linux, UNIX, and Windows using GTK, offering a rich and featureful environment for reading, study, and research using modules from The SWORD Project and elsewhere. It is open-source software, and available free-of-charge to all.

GUESS - The Graph Exploration System

Open Source Graph Visualization Tool

GUESS is an exploratory data analysis and visualization tool for graphs and networks. The system contains a domain-specific embedded language called Gython (an extension of Python, or more specifically Jython) which supports the operators and syntactic sugar necessary for working on graph structures in an intuitive manner. An interactive interpreter binds the text that you type in the interpreter to the objects being visualized for more useful integration. GUESS also offers a visualization front end that supports the export of static images and dynamic movies.

Walrus - Graph visualization software

Open Source Graph visualization Tools

Walrus is a tool for interactively visualizing large directed graphs in three-dimensional space. It is technically possible to display graphs containing a million nodes or more, but visual clutter, occlusion, and other factors can diminish the effectiveness of Walrus as the number of nodes, or the degree of their connectivity, increases. Thus, in practice, Walrus is best suited to visualizing moderately sized graphs that are nearly trees. A graph with a few hundred thousand nodes and only a slightly greater number of links is likely to be comfortable to work with.