SpeedCrunch

Open source desktop calculator

A fast, high-precision and powerful desktop calculator.
Using SpeedCrunch you type the expression that you want to calculate and press Enter. You can paste the expression from the clipboard (that you copied from somewhere else) and you can copy the last calculation result to the clipboard using Ctrl+R.

Gephi - Graph Visualization

Gephi is a tool for people that have to explore and understand graphs. Like Photoshop but for data, the user interacts with the representation; manipulate the structures, shapes and colors to reveal hidden properties. The goal is to help data analysts to make hypothesis, intuitively discover patterns, and isolate structure singularities or faults during data sourcing. It is a complementary tool to traditional statistics, as visual thinking with interactive interfaces is now recognized to facilitate reasoning. This is software for Exploratory Data Analysis; a paradigm appeared in the Visual Analytics field of research.

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.

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.