The projects listed below are open source projects hosted on code.google.com. These projects issue regular releases which will be listed in the project's download area. Feel free to use the project's issue tracker to log bugs and feature requests, and the project's wiki to document tips and tricks.

Contributions to these projects are welcome: if you are interested in contributing, please join the fun and post a proposal to the Developer Forum for that project.

The following sample code can help provide a foundation for your integration. Select the appropriate sample code for your environment below. The sample code projects are licensed under the Apache 2.0 license.

The following projects are integrations of Google Checkout with open source shopping carts. Select the appropriate project for your shopping cart software below. They are licensed under the GPL 2.0 license.