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Stimulus manipulation
Up one levelFree and almost-free packages for manipulating images and sounds
Audacity
Audacity® is free, open source software for recording and editing sounds. It is available for Mac OS X, Microsoft Windows, GNU/Linux, and other operating systems.
GraphicConverter
GraphicConverter X/Classic converts pictures to different formats. Also it contains many useful features for picture manipulation.
GIMP
GIMP is the GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. It works on many operating systems, in many languages.
Congratulations to Jean, Giulia, and Adrian!