You can use the Adobe Extension Manager to package your own extensions before submitting them to Adobe for distribution on the Adobe Exchange website. After packaging an extension, test it by using the Extension Manager to install it locally. Guidelines for writing and testing your extensions can be found on the Adobe Exchange website (www.adobe.com/go/exchange). For information on how to configure and test extensions, review the “How do I ensure that my extension will pass Adobe testing?” section of the Adobe Exchange site help. After you have written and tested your extension, you can package and submit it.

You can find more resources for creating extensions in Extending Dreamweaver Help, Extending Flash Help, and Extending Fireworks Help.