Spotter is software that can check students' answers to symbolic and numerical problems in math and science. It recognizes an answer regardless of the form it's in, and the instructor can put in helpful hints as responses to frequently-occurring mistakes. Symbolic answers can be input in a notation closely resembling normal human math notation (e.g., xy rather than x*y, and sin x instead of sin(x)). Spotter runs as a Perl CGI application on a Web server; the student doesn't need to install any software.
The Pure Perl RayCaster is a small simple ray-casting application written completely in Perl without using OpenGL or any other 3D API library. For the GUI, it uses wxPerl. It can load a 3D object from a file (in RAW format), display the object in wireframe perspective view, allow you to orbit and zoom your camera, and produce a user defined size ray casting image of the current view in a predefined color theme, with or without smooth shading. It is well suited for educational purposes, in order to study, understand, tweak, and try well known fundamental 3D computer graphics techniques.