Jmol is a Free, Open Source molecule viewer and editor. It is a collaboratively developed visualization and measurement tool for chemical scientists. Jmol is an active project, and there are new features being added to it on a daily basis. Users are encouraged to modify it to fit their needs and to contribute their changes to the project.
BALLView is an extensible viewer for bio-molecular structures. It provides all standard models and offers rich functionality for molecular modeling and simulation, including molecular mechanics methods (AMBER, CHARMM, and MMFF94 force fields), continuum electrostatics methods employing a Finite-Difference Poisson Boltzmann solver, secondary structure calculation, molecular editing and docking. Since BALLView is based on BALL (the Biochemical ALgorithms Library), it is easily extensible on the level of C++ code. In addition, it provides a Python interface with Integrated Development Environment features to allow interactive rapid prototyping.
Cell Electrophysiology Simulation Environment is a framework to perform electrophysiological simulations. It can, for example, simulate cardiac myocyte electrical activity. It is useful for simulations of action potentials, individual ionic currents, and changes in ionic concentrations.
ChronoJump is software and hardware to track jump, run, and reaction time and pulse. It uses a contact platform suitable for two events (in-platform, out-platform), and also a chronometer printed circuit designed ad-hoc in order to obtain precise and trustworthy measurements. Chronojump consists of free software and open hardware. It features a simulator that can be used if you don't have the hardware.
Asymptopia Flashcard System uses Motif and LaTeX to produce, manage, and use attractively formatted flashcards. You load some or all of your "collections" and set the timer for pop-up frequency. The GUI interface and "Collection Manager" make creating and modifying flashcards as simple as pushing a single button. A knowledge of LaTeX is only required when entering special symbols.
The VP7 Way Kool Project is a GTK application which simulates a laboratory experiment with radioactive nuclei. The user can choose between many predefined radioactive sources or create new ones. The number of decayed nuclei and the activity of the source can be determined with a built-in counter. The beam can be attenuated with shields of paper, aluminium, and/or lead.