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No. ADE is software that handles DRM -- Digital "Rights" (Restrictions) Management. You need it if you choose to buy DRM-locked ebooks (I'm one of the people who chooses not to; why vote with my wallet for something against my own best interests?)
Calibre is ebook management software. It lets you organize your ebook library, convert formats (those that are not DRM-locked), load books on your device, and so on. You can import ebooks you got from anywhere and everywhere into Calibre and tag them, sort them, and generally mess around with them. Think of it as your ebook library's card catalog and circulation desk.
Also, when you have a question, you should really start a new thread for it, not hang it on the end of an unrelated thread. Your question here doesn't have anything to do with donating to Calibre, and it won't be seen by a lot of people who could give you better answers.
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