The applications created in Google Mashup Editor are maintained by Google Project Hosting. You can access your projects by logging into http://code.google.com/hosting/ and clicking the "My Profile" link in the upper-right corner of the page. Every project has a website complete with a wiki, downloads page, and issue tracker, as well as a Subversion repository where you can access previous versions of your application. You can also use the Subversion repository to write your code in your favorite desktop-based text editor, although you must continue to compile and test your applications in the actual Editor.