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Check out the eXo IDE for a cloud based way to build App Engine Applications

Developers Can Now Build, Debug and Deploy Java and Python Apps Directly to App Engine from eXo Cloud IDE. Full Java development environment - from code, debug to deploy - in the cloud; Free access at...
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Another option (for small projects) is to use Apps Script. The editor is also completely "out there," and it now offers publishing to the Chrome Store.
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