Where can I find online interactive versions of classic experiments in psychology for the purposes of teaching? It's often useful and fun for students to experience well-known psychology experiments. Where can demo versions of famous psychology experiments be found online? 

Some example paradigms that might be useful include:


Stroop
IAT
N-back
Visual search, particularly pop-out effects
List presented alphabetically

Cambridge Brain Sciences (cambridgebrainsciences.com)

Several "brain-training" type experiments including span tasks, mental rotation, and paired associate memory. Some tests require free registration on the site to complete. Data from the tests may be used for research purposes. Created by Adam Hampshire and Adrian Owen at University of Western Ontario.

Cognitive fun! (cognitivefun.net)

Several n-back variants, basic response time tests (e.g. go/no-go), subitizing demo, flanker task, working memory span. Creator/source unclear.

Dual-Task (dualtask.org)

Demonstrations of multi-tasking limitations. Experiments are Java applets. Site created by Hal Pashler at UCSD.

Go Cognitive (gocognitive.net)

Several cognitive experiments, including change blindness, visual search, implicit memory test, working memory capactiy, and selective attention. Experiments are Flash based. Site created by team at the University of Idaho.

Project Implicit (https://implicit.harvard.edu/implicit/takeatest.html)

Many variations on the implicit association test. Data is collected for research purposes. Created by team at Harvard University.

Simons Lab (simonslab.com)

Several videos of classic selective attention / inattentional blindness studies, including the famous gorilla study. Students can do the gorilla study by watching a YouTube video. Videos of other experiments are more descriptive and less interactive. Site created by Daniel Simons at the University of Illinois.

Stroop demos


http://ezyang.com/stroop/ - sequential presentation of words, press key to respond.
https://faculty.washington.edu/chudler/java/ready.html - simultaneous presentation of whole list. read aloud and hit button to indicate that reading is complete.
http://www.math.unt.edu/~tam/selftests/stroopeffects.html - simultaneous presentation of whole list. read aloud and hit button to indicate that reading is complete.


Swarthmore Cognitive Psychology Demos (http://cogscidemos.swarthmore.edu/)

Three experiments: Visual search, Sternberg working memory task, &amp; reverse Stroop. Implemented in JavaScript. Some parameters of trials can be adjusted. Data is nicely summarized at the end of the experiment, e.g. search functions are fit for the visual search task. Created at Swarthmore under the direction of Frank Durgin.