libquantum is a C library for the simulation of quantum mechanics, especially for quantum computing. It provides an interface for a quantum register and for all important quantum operations. An efficient model for decoherence allows an analysis of quantum computation in a realistic environment.
pyXSD maps XML and XSD (XML Schema) files into Python, checks the XML against the schema, and transforms XML documents according to user-specified Python classes. There is a framework to make these transformation classes easy to write. The program uses a simple, pythonic, non-DOM interface with the XML tree structure.
OpendTect is a seismic interpretation software system. It enables you to process, visualize, and interpret multi-volume seismic data using attributes and modern visiualization techniques such as stereo viewing and volume rendering. Visualization elements can be moved freely through data space to interactively analyze data from stored volumes, or data calculated on-the-fly. For more advanced work, commercial plugins are available.
QuBit is a library to support quantum superpositions in C++. This allows each variable of the CQuBit type to hold a number of different values at the same time. Normal mathematical operations can be performed on a QuBit, but they affect every value in the QuBit, at the same time. Binary operations on two QuBits cause a result based on every possible outcome.
Hasard is a pseudo-random number generator (PRNG) library. It includes multiple engines (algorithms): Park-Miller, Mersenne Twister, Linux device (/dev/urandom or /dev/random), and more. It has a simple but powerful API. For example, a PRNG seed can be generated using strong entropy (using a hardware random number generator like /dev/random on Linux). The library is written in C, and a Python binding is available. The word "hasard" is the French word for "randomness" or "chance".
Math::GSL is a Perl API to the GNU Scientific Library, which contains a large set of tools for writing scientific computing applications, like statistical distributions, special functions, random number generators, linear algebra, numeric integration/derivatives, FFTs, wavelets, and much more.
The Particle System API allows C++ application developers to easily include dynamic simulations of groups of moving objects. The API is much lighter weight than a full physics engine. It is especially useful for eye candy in games and screen savers, but is also used in off-line animation software. With the Particle System API you create a group of particles, then describe the components of the particle effect using actions like Gravity(), Explosion(), and Bounce(). You apply the actions to the particle group at each time step, then read back the particle positions and other attributes into your app, or send them directly to the GPU as a vertex array or as geometry instances.