There are many resources available via the web. A good starting point is a wikiversity site that we started called ‘economic classroom experiments’. To get there just google ‘economic classroom experiments’. This describes how to run many classroom experiments and has links to all the other resources mentioned here. You are invited to help to develop this website. If you find any links missing, please add them. If you can report on a teaching experiment you conducted, you are cordially invited to make your report available via this website. The site is among a selected group of Wikiversity Featured Projects.
If you wish to run a computerised classroom experiment, the easiest site to get started is Veconlab, developed by Charlie Holt. This site consists of almost all the basic economic classroom experiments. Holt has also written a textbook Markets, Games, and Strategic Behavior (2007) that has a chapter for many of the games available on this site. The site is very reliable and works anywhere you have a web browser.
Another site, FEELE, is one which we developed as part of an FDTL5 grant. It mimics Holt’s site and is meant to be a complement. Since we offer KIOSK you may also want to start Veconlab experiments via our website.
Econport has a beautifully written version of the double auction (Vernon Smith's basic demand and supply curve experiment) with extensions to financial markets. The site also offers a very useful online handbook for micro economics and much more.
For a game theory or microeconomics course, one should take a close look at Ariel Rubinstein’s site. He makes it fairly easy to design the module as a whole and track student responses. All the experiments are homework experiments on decision and game theory and are played via the web so do not take up lecture time.
Denise Hazlett has details of six of her macroeconomic experiments via the website http://people.whitman.edu/~hazlett/econ/.
Last but not least, there are plenty of resources and links available on the classroom experiments page of the Economics Network.