Adobe tools if you want to test the extension.
Extension Builder for eclipse to make it easier to build the extension - http://labs.adobe.com/technologies/extensionbuilder3/
Renaun Erickson is a Technical Evangelist at Adobe Systems. Renaun has worked on projects using web and mobile technologies for over 7 years. Renaun can be found at his blog http://renaun.com/blog and at twitter @renaun. You can check out a bunch of his open sourced examples and code libraries at https://github.com/renaun. When he’s not programming, Renaun enjoys playing games, the outdoors, archeology, driving a Jeep, and spending time with his family.