A nonlinear presentation software (source files)
multitalk_source-1.4-3-source
Multitalk is an SDL based presentation program with slides laid on a grid instead of linearly. Slides can have any size (bigger or smaller than the screen, and you can move in both directions between them. Hyperlinks are also possible.
A PDF on how to use Multitalk and examples are found in /system/documentation/packages/multitalk.