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Principal Sponsors

The William and Flora Hewlett Foundation
The Hewlett Logo

Makes grants to address the most serious social and environmental problems facing society, where risk capital, responsibly invested, may make a difference over time.
The NSF LogoNational Science Foundation

An independent federal agency created by Congress in 1950 to promote the progress of science.

Excellence Center of Science and Mathematics Education at King Saud University LogoExcellence Center of Science and Mathematics Education at King Saud University

King Saud University seeks to become a leader in educational and technological innovation, scientific discovery and creativity through fostering an atmosphere of intellectual inspiration and partnership for the prosperity of society.

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PhET Source Code

Where can I get the source code for the PhET simulations?

The source code for all PhET simulations is hosted at Unfuddle (login with username: guest and password: guest). The latest version can always be found there. To checkout the source code, you will need a Subversion client such as TortoiseSVN (Windows-only) or SmartSVN (all platforms), or a command-line client. To checkout the source code for all of PhET's Java simulations using a command-line client, use the following command:

svn checkout https://phet.unfuddle.com/svn/phet_svn/trunk/simulations-java simulations-java --username guest --password guest

To checkout the source code for all of PhET's Flash simulations, replace "simulations-java" with "simulations-flash" in the above command.

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