Python Mesh Viewer is a very basic tool to display and play with 3D models. You can either construct them in the code (by defining points, triangles, and quads) or load them from a file. Currently, the only file format supported is the ".mesh" format from the closed source software medit. The rendering is done with absolutely no hardware acceleration (no OpenGL).
iDMC is user-friendly software for the simulation and analysis of non-linear models. It was designed both as a teaching and research tool, and is very easy to use (a user’s guide is available). Numerical calculations are performed on models included in the package, or any model formulated by the user and easily encoded (a few lines with no compilation necessary). The Java graphical user interface provides fast generation of graphical data of good quality, which can be saved as .png files. Hard computational tasks are delegated to a separate, small C library.
Peklo is a graph editor and an environment for visualizing and comparing different algorithms for some graph theoretic problems. Currently implemented are algorithms for maximum flows (including multi-commodity and balanced flows), minimum cuts, shortest path, minimum spanning tree, and maximum matching.
The aim of auch (audio-checker) is to visualize music. It takes audio from the microphone and uses it to simulate an elastic and vibrating surface (chladni-tranform) or the reflection of such a surface (makyoh-transform). Many more transforms can be activated by unlocking the interactive shell.
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.
SAGA GIS (System for Automated Geo-scientific Analysis) is a geographical information system (GIS). The SAGA GIS API supports grid data like digital terrain models and satellite images, vector data, and tables. This API makes it easy to implement new algorithms and exempts the developer from hassle programming overhead like user-interface design or file I/O. SAGA GIS comes with a large collection of modules, in areas of terrain-analysis, geo-statistics, image processing, and process simulation.