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There are as many ways of creating visual stimuli as there are vision experimenters. Here I have listed all current solutions that I know of. If you know of others, let me (firstname.lastname@example.org) know. At a first instance, check out Hans Strasburger's "`Software for visual psychophysics`_" webpage, which has much more coverage than this page. I have here mainly limited listings to projects that appear to be under active development or support. The PsychToolbox_ is a great, free program that uses Matlab to display stimuli. Historically it is a Mac OS Classic application, but now a Windows port is available. A native OpenGL Mac OS X version is on its way. (Source code is available but not open source according to the `Open Source Initiative`_.) PsyScript_ is a Macintosh program for generating stimuli. Free, open source (GNU Public License). Uses AppleScript and a language based on ECL (experiment control language). Psyscope (classic Mac OS) users will be pleased to note `Psyscope X`_, is being ported to Mac OS X under the GNU GPL. Presentation_ Free (no longer appears to be free: 12/2005) Windows based stimulus generation. Uses DirectX. WinVis_ web-based and Matlab based stimulus generation programs. VSG_ uses proprietary hardware and software to generate stimuli. It lacks any hardware-accelerated 3D features. `OpenRT and OpenRT-3D`_ OpenGL stimulus generation. Free, open source. (These links do not work any more... but there is OpenRT at http://www.openrt.de/, which is an OpenGL-like project used for real-time ray tracing). PsychoPy_ uses python and OpenGL together. Free, open source. PXLab_ a collection of Java classes for running psychological experiments. Free. Guimigolus_ is a free extension to VisionEgg, that is able to guarantee framelossless presentation of Stimuli. We were able to create stimuli that run for **13 hours at 200Hz with not one frame lost** on a Win2k-System. This extension provides the programmer with a cpu-meter showing the time used for each frame, which is a great aid to time critical development. It has a very complex and great algorithm for measurement of buffer overruns. Not much documentation, and only german one, because we developed it in a course at the Carl v. Ossietzky University Oldenburg/Germany. Authors are Daniel Migowski and Guido Scherp. Download the file here: http://artis.uni-oldenburg.de/~migo/Guimigolus-0.7.win32.exe We won't develop Guimigolus any further, so we give it away now under GPL. Maybe it helps someone. .. _`Software for visual psychophysics`: http://www.visionscience.com/documents/strasburger.html .. _PsychToolbox: http://www.psychtoolbox.org .. _`Open Source Initiative`: http://www.opensource.org/docs/definition.php .. _PsyScript: http://www.maccs.mq.edu.au/~tim/psyscript .. _Psyscope: http://psyscope.psy.cmu.edu .. _`Psyscope X`: http://psy.ck.sissa.it .. _Presentation: http://www.neurobehavioralsystems.com/software/presentation/index.html .. _WinVis: http://www.neurometrics.com/winvis/index.jsp .. _VSG: http://www.crsltd.com/catalog/vsg25 .. _`OpenRT and OpenRT-3D`: http://www.cs.dal.ca/~macinnwj .. _PsychoPy: http://psychpy.sourceforge.net .. _PXLab: http://www.pxlab.de