Planets is a fun, interactive program for many-body gravity simulations. The emphasis is on play: it's easy to add in planets, zoom in and out, change the physical constants, save and load configurations, etc. It's designed to be easy enough for a kid to enjoy, but that hardly precludes adults.
Gamma Low is a multi-player RTS in which two opposing teams of light-based lifeforms fight for the dominance over a cellular system in match style. The players in each team are split into different classes (strategist, tacticians, workers/attackers/supporters) and have to conquer all enemy cells in order to win. They do so by harvesting resources, building structures, researching technologies, creating deadly viruses, and fighting harsh battles.
In p, a bunch of particles interact with each other according to this simple rule: every particle moves towards, away, or watches other particles. When the program starts, each particle chooses a random color, position, and the particles with which it will interact. As the program runs, some particles join together to form a train and journey together thereafter. Some orbit each other. Some collapse into each other. Some form swarms that split and join. One cannot predict when or where or how many of these behaviors will emerge, but they usually do.
c64img is a PHP script that converts an image (JPEG, PNG, or GIF) to an image that can be shown on a Commodore 64 (FLI style). It searches for the best possible colors in the 160x200 (X-doubled) resolution, and uses a simple dithering method to distribute errors. It outputs a 640x200 image consisting of the resampled original on the left and the dithered C64 image on the right.
JSBSim is a multi-platform flight dynamics model. The FDM is essentially the physics/math model that defines the movement of an aircraft under the forces and moments applied to it using the various control mechanisms and from the forces of nature. JSBSim has no native graphics. It can be run by itself as a standalone program, taking input from a script file and various aircraft configuration files, or it can be run as an integrated part of a larger flight simulator implementation that includes a visual system. The most notable usage example is the FlightGear simulator. JSBSim models the aerodynamic forces and moments by the classic coefficient buildup method.