Useful Links

GNU Octave, a Matlab alternative

Other Software Packages

Visual stimulus presentation software:

Toolkits for auditory experiments:

Toolkits for Psychometric function fitting and other data analysis:

Toolkits for colorimetric calculations:

Toolkits for controlling special hardware:

Device drivers and diagnostic tools:

Interesting Technical Documentation on the Web

Sound under Linux:

Graphics card technology:

Hardware tests (graphics and other) and technical articles about hardware

Display technology:

Interesting articles about modern flat panel technology - and probably a good explanation why you should not use them for well controlled stimulus presentation, especially not for motion stimuli.