Previous versions of Xcode... advertised anywhere?

Peop开发者_运维百科le seem to be coming up with links to download previous versions of Xcode (which I used here). Is there a page on apple.com that advertises these, or is this just secret knowledge?

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Newest Xcode

old versions from old site (under developer tools) (requires login/registration): long link

EDIT: Here's a fun article that shows you how to do it as well

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URL: <http://connect.apple.com>; login; click "Downloads", "Developer Tools".